Board Thread:Support Requests - Getting Started/@comment-27205583-20200106124457/@comment-1038387-20200106212858

A link to your attempt would've been better. You seem to be creating that in the Category namespace rather than Template. You need to import the template under the same name, Template:Infobox character.

As for the broken things, they're templates you don't have. The tab you probably don't need. The id: link at the bottom is an interlanguage link you can remove.

For all of this, I recommend you edit in Source rather than VisualEditor.