How do I add search engines to QSB?

[Will Adler]

I want to make QSB replicate Chrome's search behavior in that I can have several engines with defined keywords that speed up searching. For example, in Chrome I can type "yt, tab, cute cats" and hit return to find YouTube videos of cute cats.

It seems like Wikipedia is already in there, among others, but can I add other websites like I can in Chrome?

Thanks!