Want to transfer domain, can't find right page

[mc se7en]

Hey guys, I bought my domain through another site last year and it's expiring on Monday. I want to transfer it over to x10 and just buy/renew it from you guys from now on, rather than having to deal with another site as well. Where do I need to go to transfer my old domain over to here and then set it to start autorenewing. Would it just be easier if I wait until it expires Monday and then re-purchase it through x10?

Thanks!