To make the side menu slide form the right side instead of the left side as its the default, you will simple add the side="end" property to the <ion-menu> tag.
For example:
<ion-menu menuId="main-manu" content-id="main" side="end"></ion-menu>
You will see that the side menu slides from the right side now.
Hope that works.
Here's an example of how it will look:
<ion-menu menuId="main-manu" content-id="main" side="end">
<ion-header>
<ion-toolbar>
<ion-title>Menu</ion-title>
</ion-toolbar>
</ion-header>
<ion-content>
<ion-list>
<ion-item>
Menu 1
</ion-item>
<ion-item>
<ion-menu-toggle>
<ion-button color="danger">Close</ion-button>
</ion-menu-toggle>
</ion-item>
</ion-list>
</ion-content>
</ion-menu>