My recommendation is take it to the Ford dealer and have them show you how to do it and then have them print out the instructions and document the date and time you were trained by them. Then keep a log each time you set and exit tow mode with picture of shifter in postion as staed by dealer...
This the Bulletin that all the Ford Dealers are using to decline transmission warranty work which puts the fault on the Owner/User.. Mine just failed as well and spoke witht he actual trans tech who said the Ford instructions are wrong which is why the transmisssions are failing. For more info...