So are you still having an issue?
Here is a walk through with how to do it via our website:
Sign in via steam
It will take you to this page:
It will take you back to toribash, click on purchase with your desired amount:
After clicking on purchase you're order has been made but YOU need to authenticate it, so click the link:
Here it will say Authenticate if you have the needed balance.
If that does not work for you then I'm gonna need some more information on your issue(Screenshots).
~Tuna