You need to open a citypay.io from your browser. Once the page is fully loaded you should press on the Get Started button. The registration window will appear. Feel all fields and click on registration. To complete registration verify the E-mail address by clicking on the link sent by Citypay.io on your E-mail address. When you click on confirm the E-mail button, the citypay.io will be opened in the new tab. Fill all mandatory fields of the Authentication window.