I have questions about metatrader 4

I’m confused with swap fees, when they’re charged. I had a broker who made it look easy, but he isn’t helping anymore. Ready to give up and back out of the platform. Any guidance help is appreciated.

I don’t think it’s metatrader 4, it’s just carry trade if you want to look it up. If you are trading currencies every economy has an interest rate in which at the end of each trading day your broker will debit/credit the interest rates differentials to your account.
freshman-audjpy-interest-differential-long

And the reversal is also true if you sold AUD/JPY from the picture above you would had the loss of 4.40%.

This link might help you. There’s a formula on how to calculate swap fee.