whois – How to determine, who to contact for transferring my Domain

My client’s domain, www.daccusa.org, is hosted at inmotionhosting.com. They tell me though, that the domain itself, is not.

I’ve spoken with two different customer supports at inmotionhosting.com and they both tell me two different things. One says “I have to get in touch with www.joker.com” and the other one tells me that “I have to get in touch with webhosting.dk“.

According to my whois search, the registrar is Joker and the name-server is Webhosting, and according to the control-panel over at joker.com, I don’t have any domain registered, but I can however login with my information (e-mail and re-generated password).

(WHOIS)

I want my domain transferred to inmotionhosting.com – which one (Joker/*Webhosting*) should I ask for the transfer?