I don't know the specifics, but generally speaking, you put one device in discovery mode and the other I search mode, and when the devices detect each other, enter the code that appears. Anyway, for specific instructions, check your owners manual that came with your Dodge.
Welcome to iMore! It really depends on which uConnect system you have in your car. Click here to access the uConnect site for your truck. Use the drop down at the top right to select the uConnect system that applies to your vehicle. It will walk you through pairing your phone.