Perfectstorm gave you very good and correct advice to answer your questions.  Once you get a profile after your first review you can correct any incorrect information by submitting problem reports.  That is the only way to change any information on your profile.  There is no list of provider websites on TER, only a list of providers.  Once your profile is linked to your posts, after your first review, each time you post on any forum, hobbyist can go directly to your profile without having to search for you.  

If your profile has a phone number on it, a hobbyist can search for you using your phone number, but you have to let your first reviewer know it is ok to include your number in his review.  If you don't tell him that, you will have to do the problem report to have your phone number added to your profile.

Swim