How will i know if the project in APPEN is UHRS?

I already have a clickworker account and have been working at UHRS with clickworker as the vendor. I want to try Appen projects as an alternative, (because UHRS is so dry right now) but i’m worried I’d apply for UHRS based projects? Clueless about appen right. now. Please Help?

I read that you are not allowed to work at 2 different vendors in UHRS.