If you have Citowise wallet installed on your devise you can to click on URL and your devise will ask you if you want to open this URL with Citowise wallet. Click on Citowise wallet icon in poped up window. You will see an Ico screen with all details already prefilled. Confirm the transaction with your password. That's it!
If you use any other wallet that does not support Citowise wallet URL's you have to setup payment manually. Initiate payment in wallet of your choise, scan or copy-paste address of Ico campaign into address field, fill in currency type and amount you want to contribute and confirm transaction.