User blog comment:Wolftooth/Links/@comment-4751506-20140703031409

If you're in Visual mode, on the toolbar at the top, there'll be a small button that looks like a set of chains (sort of an oblong shape with a line through the middle, next to the Bold and Italics buttons). If you click on that, it'll take you to a window that says "Target Page or URL" (here you'll put in the name of the page that you want it to link to, or the URL that you want). Below that, there's a space for "Text to Display" where you can write what you want the text to be.

For example, this goes to my userpage, but instead of saying "User:RedPandaPotter," it says "this". :)

Or you can just put two brackets on either side of the text - and  with no spaces around the desired page. If you want to rename the link or the text to display, just put a | after the link and then write what you'd like!