How do you use a repair pack in off-road out laws?

When you have a vehicle, go to customize-body and if you scroll through the options of things you can put or do to your vehicle, you will see an option called “repair pack”. Buy it and install on your vehicle. Drive the vehicle anywhere and when you get damage, you can select the repair pack next to the tach and repair your vehicle in game instead of having to wait till you return to your yard. Use the pack and it will credit you. Hope this helps.