If you want to see another provider, she may ask you for a reference and you would give the name of the provider you saw.

Some providers whitelist you on their own and others have to be asked.  Some providers won't whitelist you after only one visit.

Whether it's a reference or a whitelist, they usually will check with the other provider anyway

...When you see a provider if she is a TER member And she has the Free Limited Provider VIP membership she can "white list" you. She does this for you with her provider access. You can ask her or she may do it without you asking. I've had both happen. You can find who white listed you by going to the "My Ter" tab at the top of the page. Click it then look to the left and click "My Referrals". If you have any white list ("referrals") they will be listed there. The provider's name will be there.  

You can also use the provider as a reference by simply giving her e-mail or phone # to the lady you want to see so she can contact your reference. This is done all the time.