Replacing a Waeco FF70 lid

I have just recieved my fridge lid from Waeco in the mail [Courier actually].

Having the mechanical aptitude of a "nonce" someone want to 'step by step' me on how to replace the one thats there.

It is the older style [got it cheap from Fridge Shop] and it is fitted with what appears to be a complete hidden hinge that runs along the complete back side of the lid. It is encased inside some plastic runners.

There is a little [tiny] hole that is located on the vertical face of the lid at the end [narrow side] of the lid. Am I guessing right in believing that I have to push the hinge inside that hole and it will spring out and then I have to fiddle the new one back into the same hole.

Any help appreciated.

Dave