I don't have the right FTP password?

glutenfreedee.com is the site I need help with. I’m trying to update my wordpress site, and I’ve put in the password to log into the admin of my site, I’ve used the password I log in for this account and other various passwords I may have used, every time I get this error message; “Failed to connect to FTP Server glutenfreedee:21”

Everywhere I go, I am told that it is supposed to be the same as my domain password, but nothing’s working. Any and all help is very much appreciated, thank you!