Account access

Ive had a website with dreamhost for almost 5 years but have
made changes only twice so I forgot how to access my data files…I tried the ftp to “mydomain”.com but I/m doing simething wrong because it won’t do anything…how do I get into my data files…I know my username and password but I never get that far…Help?>>>

If you email from the email account with which they have on file for you, they can tell you how to get in. However, ftping to your domain name should let you in unless you’re domain has expired which would explain it.