Just don't make the mistake of trying to make your boss and co-workers your friends. They are fellow employees, not friends. Any friendship effort should be conducted outside the business establishment and not during work time.
Be cordial, energetic and attentive. Study the job description and standards of performance for your assigned station and do your best to comply and exceed standards when you can. During your training sessions, ask lots of questions if something isn't clear or you need to know more about the chain of steps executed before and after yours to better understand where your station fits in the big picture.
If you end up working an order/cashier station, Burger King prides themselves on their ability to customize burger orders for each customer so be sure you listen carefully and give the customer time to add any preferences before assuming you know what and how they want it. If you need to, repeat it back to them to confirm you have it correct.
Good luck with the new job, DD. Do me a favor? This time if you have some issues to air or want advice on how you should react to something, post here before
you make any impulsive decisions like quitting the job. Think of all the grief you could have saved yourself if you'd done that the last time.