Board Thread:Support Requests - Getting Technical/@comment-35061763-20180501222954/@comment-9605025-20180501225425

I suggest you read Help:Infoboxes for more information in infoboxes, including how to create them. However, to directly answer your question, you can use source mode as described on that page to either edit, copy then edit, or create from scratch a portable infobox. Alternatively, on the wiki to which you wish to add the infobox, go to "Special:InfoboxBuilder" and use the GUI.