do you mean you would like to be an affiliate of the site?

Yeah are you wanting to be an advertiser or a publisher, (affiliate)?

I think he wants to be an affiliate, but does not know that affiliates are the ones that promote CPA offers and get paid from the CPA Networks.

CPA: Cost Per Action
Affiliate: One who promotes CPA Offers
CPA Networks: One who provides with a CPA offer (the website where you need to register as an affiliate)
Advertisers: People who pay commission to the CPA Networks to have their CPA offers advertised by the Affiliates of the CPA Networks.

Affiliates and Publishers are synonymously used terms.

I have never heard of CPA promoter.

I hope that helps.