What loader do you have? On Bobcats at least back to the C series there is a knob on the cab floor on the right side of the seat. Pull up on the knob and then push the pedal to lower the boom.
To tow there are two issues: the parking brake and disconnecting the drive motors.
1. The parking brake is in the top of the chain case on Bobcats. You have to raise the cab and you will find a solenoid with three wires near the front of the loader. remove the bolts and pull the unit straight up. You may have to rock the machine forward or back while pulling it. If you are just going to pull it up on a trailer, this may be the only thing you need to disconnect.
2. To disconnect the wheels you can unbolt the drive motors and pull them free of the chain case. You will probably have to disconnect the hydraulic lines. Make sure you cover the hose end to prevent any dirt from getting into the system.
I know my dealer uses a rollback truck and just uses the winch to drag the loader up on the bed.