Using ftp clients on various web hosts requires different infomation to be sent, usually in the case of a subdomain the ftp address will still be the main domain for example dhost.info. I have a subdomain there and the address to the site is
http://dhost.info/stevedemarcus/steve/ for me to ftp though the ftp address is ftp.dhost.info then I use a user name that was provided from the host (until I changed it to somthing that made sense) and my password was also assigned (which I also changed to make more sense) other web hosts may allow ftp acces by using a subdomain ftp address but I haven't seen too much of that.
The user that had the question about ftp might have to use the address of
ftp.marginoferror.com and it is even possible but not likely that it is an anonymous account with no password required but not very likely as anyone could go wreck that site with their own ftp client. se they will have a username and password either that they chose themselves or that was emailed to them when they opened their account.
I haven't tried the site until just now and it is nonexistent this could be a spelling error, but with that spelling it is not there.
Maybe the original poster will come back with more info about their account and get some further help with their problem
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