Now walk up to the area again and press to open the garage menu, now select which car you want to customise and press the Customise option. Once you've hijacked a car drive into your cribs garage and into the store area and press to store the car. I found the easiest method was to steal cars from outside one of your cribs/safehouses and take them into your garage and customise from there and I suggest using the quick hijacks ( + ) to steal the cars to save some time and to work towards Bo-Duke-En in Saints Row: The Third. You can easily attain this after getting your first safehouse (Shaundi's Apartment) unlocked not long after completing the second mission (which unlocks The Welcome Wagon in Saints Row: The Third).
