Recently I changed my password, then when I oppened the game I put the new password there and it said it was incorrect, after that I tried the old one and same result, then I pressed the "Forgot password" button and used the password I recieved in an email to try to login and still it didn't allow me to login to the game. How can this be fixed?

Hi, is this the account you're trying to log in with in game or some other one?
Make sure you're entering exactly the same password as you use on the website - passwords are case sensitive.

Yes, its this account that I'm trying to log in game, I did check the password, the cases are correct, yet the game doesn't recognizes my account or password and for some reason, when I clicked in the "forgot my password" button, the email sent to me with the new password was for another account that I don't use in nearly 10 years, when I try to log in with my current account with the correct password and all, it just doesn't registrer or something.
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I changed it a third or fourth time and now its working

Are you sure you've been using the correct email to request password recovery? Because there is only one account linked to your email (unless you've recently deleted any other accounts that also linked).
When there's more than one account linked to the same email you typically receive multiple recovery messages (one per each account) so you need to make sure you follow the instructions to reset credentials for the correct account.

Either way, glad to hear you got it working so hopefully the issue is resolved now.