https://dev.fandom.com/wiki/ProfileTags

Which of the parts in particular are you not able to understand?

All of it :c

Could you maybe walk me through it?

What is the link to the wiki you want to put the tags on?

https://pet-simulator.fandom.com/f

Okay, so first go over here:

MediaWiki:ImportJS | Pet Simulator Wiki | Fandom

And at the bottom paste this:

dev:ProfileTags.js

Yup

What next?

You've left an extra blank line in that page. Try to remove that.

Now go to https://pet-simulator.fandom.com/wiki/MediaWiki:ProfileTags

O ok