Domain transfers

[ajrpix]

I have a VodaHost account and received my domain upon activation. I also have two other domains registered with another company that will have to be renewed in June. How do I move them to VodaHost and what is the cost? Am I eligible for the one free transfer if I already received the free domain when I registered? Are these Addons? Or different as I don't want to redirect but actually have the registration with Voda?
Thanks,
Andrew