A woman told me she is going to put money in my account and wants my login username and password. Is this real or should I say no?
You should say No
Frankly I'd be suspicious enough I'm not sure I'd even give her the legit details to send money properly.
You can't actually transfer money into a bank account from that bank account. She should only ever need your sort code and account number to send money to you!
There are exactly two possibilities here:
It's a scam and she's going to steal all your money
She doesn't understand how bank accounts work
There is absolutely no reason she would need your login details and nobody should ever need them except you.