Very simple once you progress through the actual story mode the delivery stand will open( I noticed it after completing the ginyu saga it might be earlier though). For the achievement you just have to go up talk to the robot and choose send. Luckily you can send gear too recent players so you don't have to worry if your friends picked up the game or not. Once you choose the receiver and what too send them( lv.1 training gear I sent) Click send and pop there's your achievement.