Update value inside side menu

I am having a menu whose html i have written in app.html-

<ion-menu [content]="mycontent">
  <ion-toolbar class = "menuUserName">
    <ion-title>{{userName}}</ion-title>
  </ion-toolbar>
  <ion-content>
    <ion-list>
        Item1
     </ion-list>
  </ion-content>
</ion-menu>

<ion-nav #mycontent [root]="rootPage"></ion-nav>

My app flow is login->homepage. when the user login the app,it will get username from a service. How can i pass this data to my ionic2 menu to update username.

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