The process of setting up a QuickPay account is described here:
Connect the Mono shop
Once an account has been set up, the Mono shop must be linked to your payment gateway account.
This is done here in the Mono editor: SHOP -> PREFERENCES -> PAYMENT
Here you choose the QuickPay payment gateway, and then you input the information needed to connect the shop:
For QuickPay you need to insert the “merchant ID” and the MD5 secret. This information is found in your Quickpay account.