Merchant account will be automatically created when you will go through Accept Payments -> Credit Cards -> Activate routine.
Basically it is a one page form that will ask you for all needed information to set it all up. - You don't need a special "merchant account" at your bank, you can connect your regular checking account to your store to receive payments from purchases.
Please reply if you need any farther assistance activating credit cards payments at your store or anything else merchant account related.
Steve - eez.io support