I sometimes copy/paste the full URLs directly into the text box, then use the formatting button to create the link.
I feet it can be helpful, especially to newbies, to see the full URL structure - such as those from the Help Index, Style Guide, Categories, etc. (works for Profiles, too!).
https://www.wikitree.com/wiki/Help:Help_Index
https://www.wikitree.com/wiki/Category:Styles_and_Standards
https://www.wikitree.com/wiki/Category:Categories
https://www.wikitree.com/wiki/Sheppard-2686
https://www.wikitree.com/wiki/Jones-39993
Just another learning experience!