Hello @PattyN92 ,
You can set up your prepayment from within your account's UI. Just click on your name in the top-right corner, click My Account, click Edit for your payment plan, then select which prepayment you want to commit to. You can also do this through the Plans & Pricing page if you'd like to select a different plan (Email vs Email Plus) to be prepaid for.
For detailed instructions and general info on prepayment, click here!
If you'd like to do your prepay deposit by paper check, click here for instructions!