This article looks at how you can order using an existing domain.  Let's take a step by step approach and show you how it's done.  First, you have already selected your package and you're next presented with the domain ordering screen.  Please take note of the highlight in red.

Once you click on the option to "use existing domain, registered elsewhere," you'll be taken to the next step.

Here you'll enter the domain and click "Check Domain."  After the check is performed, you'll go to Step 3.

Your domain will have a checkmark next to it.  Click on "Next Step" and you can now go on to complete the rest of your order.  If you have any other questions, feel free to give us a call at 1-877-270-7753 and we'd be happy to help.  Thanks for choosing MostHost.