Thread:TsukiHana25/@comment-39085266-20191216151306/@comment-43900458-20191217144322

If you haven’t turned on personal JS/haven’t used personal JS, go to your preferences and enable personal JS (it’s in the under the hood section) then create a page named:Username/common.js.

Then add this to it, and voliá, you have a bio!

'u:dev:MediaWiki:EditBio/code.js',