I sent the PBS site to my coworker to have her look at it  .... she said she forgot to put me down as a referral and I'm wondering if she can still add me?  I didn't know I could get a referral credit for it.

She can contact PBS and let them know you referred her.

I've made like ten referrals to this site, but got credit for none of them. None of them cared to name me as their referrer. I don't care though. It's a great site, and I don't mind helping it grow without getting credit for it.