getting 530 error, how to do?

Hello, I've made some edit in the function.php folder in wordpress and my website is down
I get 500 error when I try to view/access my website.

I'm trying to fix, but when I log in with my ftp details on filezilla I receive 530 error,
Connection established, waiting for welcome message...
Status: Initializing TLS...
Status: Verifying certificate...
Status: TLS connection established.
Command: USER [email protected]@toofame.com
Response: 331 User [email protected]@tXXfame.com OK. Password required
Command: PASS *********
Response: 530 Login authentication failed
Error: Critical error: Could not connect to server