The absolute easiest way to learn how to do a rolling backtake, condensed from the Rolling Backtakes for Everyone instructional https://www.grapplearts.com/rollingbacktakes.
00:32 Step 1, The Dope Mount Sequence
02:56 Step 2, Scissor Wedge from Leg Wrestling
05:37 Step 3, Dope Mount to Rolling Scissor Wedge Backtake
07:25 The Most Common Mistake
08:59 Step-by-Step Review

If you can do a forward somersault then you can do a rolling backtake. https://www.grapplearts.com/rollingbacktakes