If you need to edit the ActionBar text, do it in the following way:
manifests-> AndroidManifest.xml
<activity
android:name=".MainActivity"
android:label="Texto que se mostrará en el actionBar" />
res-> layout- > nav_header_main.xml
- To add or edit browser menus:
res-> menu- > activity_main_drawer.xml
You can create groups and within this, items that will be the menus that will be displayed.
For example:
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_home"
android:title="@string/home" />
<item
android:id="@+id/nav_register"
android:title="@string/register_nav" />
<item
android:id="@+id/nav_foods"
android:title="@string/food" />
</group>
To modify the content of the activity:
res-> layout- > content_main.xml
For more information: Creating a navigation side panel