The Customer Portal allows you to approve proofs online.  

Approving Proofs 

1. Navigate to My Orders.

2. Select the order with the proof needing to be approved. It should have the Action Required status.
   
   

   
   

3. This will direct you to the Order View page. Click Approve Product.
   
   

   
   

4. Read the Approval Terms.
5. Check the box to confirm you've read the approval terms.

6. Click Approve Product.