Masterpage and navigation !!

In reference to this link

https://github.com/xamarin/xamarin-forms-samples/blob/master/FormsGallery/FormsGallery/FormsGallery/MasterDetailPageDemoPage.cs

this example is working quite fine but the thing is i want to navigate from one page to other page using master page .
here in this example the color are getting fine but in that place i want to navigate to otherpage. help me with this..

Thanks in advance..!!!