With the cupholder in the retracted position, very carefully pull it straight up in the area of where the rails are that support it when it extends. Be careful not to pull it up by the cupholders themselves and break them. It is relatively straight forward if you are looking at it.
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record