Board Thread:Questions and Answers/@comment-26103034-20150712151214/@comment-3293219-20150712152805

On the new layout, look for the 'insert' tab, click it and it should have a drop down menu with media/gallery/numbered lists on it. Look for 'template' and click on it.

Then you should get a list of templates, look for 'infobox' and click that and it should come up with a blank infobox.

On the classic editor, look to the pannel on the right hand side of the screen and you should see a box for templates, infobox is the most used, so you should be able to find it in there.

If you're using source editor, then I really don't know, I'd suggest copying an infobox from another page and then editing the blanks yourself, unless there are any source experts who can explain how to make an infobox in source edit mode.