1.user login ID--------- you should know your user name
2.user password--------- you should know your password
3.ISP phone number(s)------ you get this from your ISP,
4.DMS addresses------- you mean DNS!-- ignore it for the time being
5.email login ID-------- ignore this
6.Email password------- ignore this
7.Email return address POP3 server name----- ignore this
8.SMTP server name----- ignore this
9.Proxy server(if applicable)----- ignore this
as for the ISP portion. ISP means internet service provider. i am guessing you are on broadband. you need dial up internet for the Dreamcast. dial up requires a user name and password to connect. so find a dial up ISP and the rest will make sense.