On the the newest chess.com app, (I play on my tablet) there is a menu button on the left bottom that brings up more choices, including resign. Hope that helps. :)
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If I don't resign when you have a clearly winning position against me, know that it is not my fault. I sometimes play on my Kindle and chess.com doesn't show the resign button (or draw button) on a Kindle. I really don't mean to be rude so absent a quick checkmate, you will just win an abandoned game. Blame the programmers at chess.com, not me.
(I love my Kindle so I am not getting some different device for lying in bed and computing).