Hello Aternos! 
I suggest you to add BendingGUI. It is a pretty useful plugin for servers that use ProjectKorra. It adds a menu for bendings, elements and attacks.
Link: http://projectkorra.com/resources/bendinggui.141/
Posts by SnipHacker
The Aternos forums are now deprecated
Learn more about this change here.
For help regarding Aternos, we recommend you to visit our support center.