I can't login to my WP site (need help)

Can someone please tell me where and how in DreamHost do I set up a new username and password to log into my Wordpress site? I can not login with any of my username/passwords. I would be really grateful for any info or instructions you guys can provide. Thanks in advance.

Getting a similar error. Site was fine on Monday/Tuesday, now I get an error accessing my /wp-login.php directory. But I know it’s there because I can see it all via FTP.