On this wiki I can Rename Category - which you set up for me and no way can I remember how... I do recall that there're two ways to make a script available, one just for one wiki and the other for all wikis. I'd like to use it on Fear the Walking Dead - can you help?
On Community Central create a page called User:MikeLacey/global.js and copy all this code onto it (just remove all the scripts you don't want). It should then allow the script to work for you on all wikis.