User blog:Endercreeper9999/Help with roster?

(I know, I said my next blog post was a tutorial! By the time you finished reading this and/or commenting on this, said tutorial shpuld be released as a blog post)

I've decided to increase my roster size, as I have some playable W.I.P.'s that I want to put on my roster, although I don't want to replace any of my current chars. Basically, I am trying to do something like this:



However, I cannot figure out how. I know how to increase to look like this, though:



If anyone could help, that would be nice. Thanks in advance.