How do I make one of these please? Pic included.

I wasn't sure of the name of it, but I have enclosed a pic to show what I mean.

If someone was to search for my forums on google, how would I go about making it so that the results looked nicely laid out in categories like the pic?

Thanks

you don't. Google does this automatically when they consider your site an authority in a niche.
these are called 'site links' and once available to you, you can find them in the google.com/webmasters portal.

Ok thanks Brian

Looks like I've got some more content to get writing