Help with BMR and TDEE

(I moved this to another area, but can't seem to delete this post!)

I really hope I've got this post in the right area. And as a heads up- I'm sorry for such a basic question. I've recently started to get on the weight loss bandwagon again after a few stressful months of 'accidental maintaining' during a move/uni semester. I've already lost 25+ kilos, but coming back into it all- I'm dreadfully confused as to what numbers I should be working off.

I had someone suggest to me that I use TDEE as a means to calculate my intake- but I was not informed about not counting back exercise calories. Every few weeks I meant to look back into it all and develop a better understanding- but it all continues to go over my head. I'm already quite touch and go with tracking my food intake as I find it a little triggering, but I want to make sure I can have a better general idea.

I was hoping that someone may be able to help offer some guidance as to just how much I should be eating in order to lose the last few pounds.

I'm a 19 year old female (168cm and 67-68kg), and I work out at the gym 2-3 times a week for 50 minutes. I currently suffer from a back injury so I just use the elliptical and stationary bike. I'm on the elliptical for 30 minutes on an level 6-8 incline (it usually comes up to 350 calories on the machine, but I've heard this is inaccurate?), and then on the bike for 20 minutes at a general pace. (Usually 130-150calories)

The other days of the week I attend university where I work on computers for majority of the time. (I study game design, so there's not much choice) but I walk around the campus and around my area in order to get to bus stops and what not. I keep a pedometer on my phone which says on these days I burn around 150 - 210 calories depending on how active I've been.

I'm not quite sure what I should be listing myself as activity wise, so I've plugged in the numbers for a sedentary level. With this, my BMR is 1474 and my TDEE is 1769. I usually eat to 1500- 1600 calories (roughly) a day- and if I burn 200 calories, I'll usually subtract that using myfitnesspal and then eat that back so I can net at 1500/1600.

Any tips would be greatly appreciated! I've tried reading through the forums, but unfortunately it all continues to become one big blur and go over my head.

Thanks!