<h2 class="ui header">Password</h2>
<h5 class="ui dividing header">Change your password.</h5>
<form class="ui form" {{action 'updateUserPassword' on="submit"}}>
    
 class="field">
        New Password
            
 class="fields">
                
 class="ten wide field">
                    {{input type="password" id="newPassword" name=newPassword value=user.password}}
                
            </div>
    </div>
    
 class="field">
    Verify Password
        
 class="fields">
            
 class="ten wide field">
                {{input type="password" id="newPasswordVerify" name=newPasswordVerify placeholder="Re-enter Password"}}
            
        </div>
    </div>
    <button type="submit" class="ui basic orange button" tabindex="0">
        Save Changes
    </button>
</form>

import Component from '@ember/component';
export default Component.extend({
  init() {
    this._super(...arguments);
  },
  actions: {
    updateUserPassword() {
      let password = this.get('newPassword');
      this.get('sendUserPassword')(password);
    }
  },
  didRender() {
    this.$('.ui.form')
      .form({
        inline : true,
        delay  : false,
        fields : {
          newPassword: {
            identifier : 'newPassword',
            rules      : [
              {
                type   : 'empty',
                prompt : 'Please enter a password'
              },
              {
                type   : 'minLength[6]',
                prompt : 'Your password must have at least {ruleValue} characters'
              }
            ]
          },
          newPasswordVerify: {
            identifier : 'newPasswordVerify',
            rules      : [
              {
                type   : 'match[newPassword]',
                prompt : 'Passwords do not match'
              }
            ]
          }
        }
      });
  }
});

.......
export default Controller.extend({
  routing : service('-routing'),
  notify  : service('notify'),
  uid     : '',
  actions : {
...............
   updateUserPassword() {
      this.get('user').save()
        .then(() => this.get('notify').success('Password Successfully Updated!'))
    }
  }
});

api/controllers/registerUser.py
...............
   if 'password' in data.keys():
        user.password = data['password']
        update_firebase_password(user.id, user.password)
        user.save_to_db()

$ ember g component user-component/user-account

// user-account.hbs

<h2 class="ui dividing header">Account</h2>
<form class="ui form" {{action 'updateUserName' on="submit"}}>
    
 class="ui field">
    Username
        
 class="ui fields">
            
 class="ten wide field">
                {{input type="text" id="profileName" name=profileName value=user.username}}
            
        </div>
    </div>
    
 class="ui field">
    Email
        
 class="ui fields">
        
 class="ten wide disabled field">
            {{input type="email" name=email value=user.email}}
        
    </div>
    </div>
    <button type="submit" class="ui basic orange button" tabindex="0" >Save Changes</button>
</form>

import Component from '@ember/component';
export default Component.extend({
  init() {
    this._super(...arguments);
  },
  actions: {
    updateUserName() {
      let profileName = this.get('profileName');
      this.get('sendUserName')(profileName);
    }
  },
  didRender() {
    this.$('.ui.form')
      .form({
        inline : true,
        delay  : false,
        fields : {
          username: {
            identifier : 'profileName',
            rules      : [
              {
                type   : 'empty',
                prompt : 'Please enter a valid username'
              }
            ]
          }
        }
      });
}});

…….
export default Controller.extend({
  routing : service('-routing'),
  notify  : service('notify'),
  uid     : '',
  actions : {
…………...
   updateUserName(profileName) {
      const _this = this;
      const user = this.get('store').peekAll('user');
      user.forEach(user_ => {
        _this.set('uid', user_.get('id'));
      });
      _this.get('user').save();
      _this.get('notify').success('Username Successfully Updated!');
    }
  }
});

api/controllers/registerUser.py
…………...
   if 'username' in data.keys():
        user.username = data['username']
        update_firebase_username(user.id, user.username)
        user.save_to_db()