Swapping out the radio on a 1990

So I've never done anything really with audio in cars and I just wanna know if there is anything I'd need to swap the stock radio on my na. Mainly because, aux jack

Here it is, if it matters

http://www.autozone.com/stereo-speakers-and-audio/stereo/kenwood-am-fm-cd-combo-kit-with-two-speakers/568502_0_0/?checkfit=true