WordApp comes packed with icons. Thanks to amazing projects like Font Awesome.
To change or an icon to the bottom menu.
- Login to your WordPress website.
- Navigate to WordApp->App Builder
- Then click the Menu tab.
If icons are available in your mobile theme you will see drop downs like the image below.
- Choose the icons you want to use for each menu item
- Save Changes and you're done!
You can view the icon list here