Ryobi Mower - Rear wheels locked

Anyone have any suggestions on how to unlock the rear wheels of this mower. It's appears wheels got locked when i moved the machine from my bk yard to my garage while it was off.

I've read postings that say it's a common problem and it's most likely the drive cable. However I haven't found any instructions on how to fix the problem on Ryobi mowers which are different than the gas powered mowers.

Any suggestions? Ur help would be greatly appreciated!