To setup Easy Emote, you will need to set up the script as a LocalPlugin. This tutorial will show you how you can set this up.
Firstly, go to the game link here, and click the 3 dots and click on the option to Edit in Studio.
Once in studio, look for ServerScriptService in the Explorer where you should find the Easy Emote script.
To convert this to a plugin on your device, right click on the script and click on Save as Local Plugin. Then, save it as a file on your device.
You should now be able to use Easy Emote normally!
Note: to update the plugin, you will have to repeat this steps to override your previously saved version.
Useful links:
How to use Easy Emote
About Easy Emote