Suse install via ftp is only for people on ehternet networking.. LANs, Cable modems, dedicated ethernet internet. I'd assume you were trying to dial in since you mentioned a login and password?
Suse doesnt offer iso's, You either have to have a connection to download the ftp version, or go buy it.
As far as ftp install goes.
You enter the ftp server in the server line, with no ftp://
then the directory in the next box that pops up