If you just want to transfer your domain registration, you just do with through the “Reg. Transfer - Transfer a domain registration to or from DreamHost” section of the panel.
Since this is somewhat obvious, I’m guessing that you want to transfer your hosting to here as well and so this page on the support wiki on transferring hosting may be instructive and relevant.
Free unique IP and $67 off with promo code [color=#CC0000]FLENSFREEIP67[/color] or use [color=#CC0000]FLENS97[/color] for $97 off. Click here for more options