The page didn't help.
What is your issue and what is your wiki?
Worldencyc wiki. I have an ipad and it's very hard to import
Files.
You'll need to edit MediaWiki:ImportJS on that wiki to add the following line:
dev:InputUsername/code.js
I did.
I use an IPad too.
Okay?
You didn't, you copied Dev: instead of dev:. Decapitalize the first letter in there.
Ok.
Now?
Now your Template:USERNAME is working. Isn't that what you needed?
What do you think?