I don't know how to put the back windows up in a 1998 jaguar convertible xk8

No door window switches?

I can't find any for the back windows. Where would they be?? And thank you for ans.

They go up with the "roof" button. If you push the arrow "on top" (nearest windshield) that is to put convertible top up, the last action of that process, after the top is in place and latched, is to close rear windows! To open rear windows, the reverse is true; they go down after the roof is down, so keep that button pressed. A tone should sound when all actions are completed. That would be awfully hard to figure out, without a manual, I feel for you in your dilemma!