[Q] Working with navigation drawers, android development topic

Hello
So, I'm a complete N00b on android development and java and want to work with a Navigation Drawer.
I'm using the template, yet I don't know where to define if an item (button, text field, anything) should be in tab 1 or tab 2, main activity's xml places it in both of the tabs.
I'm using android studio.

If there's anything you wanna know, just post it.

Luke