Hey guys, I work at the Hackhands team and would love to help.
After the weekend we got few tickets related to this issue, and we already replied with the instructions. If you didn't get a chance to see it, just follow the steps below:
In order to obtain the credits you will need to check these steps: - log out from your HackHands session; - click on the redeem button at: http://www.hackhands.com/education (using Chrome or Firefox) - you will be prompted to insert your GitHub credentials - log in at hackhands.com with your existing Github credentials using the Github auth at our login page.
The integration with Github is working and we have many other students redeeming credits with no hassle. If you need any further assistance, please reach us at http://www.hackhands.com/contact