Hi, welcome to the forums.
Are you with BTYahoo or BTMail?
In any case, where are you trying to add this contact - is it webmail or an app/client programme?
What is the actual problem? Are you saying the contact doesn't have a name to enter? If so, simply enter the email address.
Nope, sorry - you've got me stumped ...
Can you say what system you are using? What other information does "it" demand?
Are you trying to add a new email account to the "system", rather than adding a contact?
If you don't have the other information that it demands just enter xxxx or anything else. The system won't care what it is.