Here is how to setup you Android device on your TAK server for Atak App
The simplest option is to use the ZIP File:
In your "Welcome to EOTAK Server" email download the attached:
atakyourname.zipOpen ATAK app
Click the menu (☰) icon
Select "import" in ATAK menu
Select "Local SD" in import types
Select the downloaded zip in your file storage (/sdcard/Download)
You should now be connected to your Tak server
Need Help?
Contact EOTAK Support by clicking the support button 
in the bottom right of your screen.