Students can add additional funds via Paypal by doing the following:
Go to this link which is also posted on eLearning under Intranet (top links from any page).
Enter your Cairn username and password and click Login
Click on Budget/Recharge button on the right hand side
Choose the Amount you want to add and click on Next
Wait for the Paypal interface to load and login with your Paypal credentials
Click to confirm payment and you are all set. The payment takes effect immediately.