First of all you need a Reepay account. If you doesn't have one, you can create one right here: https://signup.reepay.com/#/en?time=1
You can always follow our guides on https://reepay.com/download-plugins/, but if you can't figure it out, we have partners that can!
Radarsofthouse is our prefered Magento partner and help our merchants all the time.
They are happy to help you install the module in your webshop. The price is 375 DKK/49 EUR excl. VAT and applies to a standard installation.
You can contact Radarsofthouse at: firstname.lastname@example.org
Should you experience problems with getting the module to work in your webshop, they would be happy to help you against a regular hourly rate.