Go to X-admin Menu 

First you should have to Create Module then click on Module 

You can see that List of Module Which Is already created. If you want to Add Your New Editor in This Existing Module So You Directly Create Function Respective Module. 

If you want to create new module Click on Add Module. 

Module Name and Description Must Be Require Field In Module. 

Click on Save Button   

Now you can see You Module Name In your Tree If it’s not Enable then Right click on tree and Refresh Child Node. 

Click on your  Recently added Module Name