Ezimove Jockey Wheel

I have one.
The pin bit that goes into the hole has a straight edge and a curved edge.
When the curved edge is faceing back, it will allow the handle to move up. Apon pulling the handle down it will grab the hole, pulling the wheel with it. Thus moving forward.
Angle bit facing forward, will do opposite, thus moving backwards, or reverse.
Both staight edges forward and rear on hole, is s, or stop.

Pulling both pins out and slightly twisting them to lock, without being in hole, is free wheeling.

I had lots of problems with one of those. It only really worked on level concrete (ehen I could move the heavy trailer easily anyway). If on grass the tread on the wheel wasn't very good and the wheel simply spun without moving the trailer. In many situations You need to move the trailer backwards and forwards while you manouver for position and changing the pins was a PITA. Any sort of slope and the wheel would lock against the pins making changing from backwards to forwards very difficult. As I mainly needed this device to help moving the trailer when there was some slope so I found the thing quite useless. A couple of years ago ther was a fair bit of discussion here regarding these wheels and many others reported similar findings to mine. Sorry to be the bringer of bad news.