In the PointSolutions Desktop software, students must have a PointSolutions account and register a subscription. Without them, you will not receive credit for your responses. You also must have your PointSolutions account connected to Canvas in order for your points to be shown in Canvas Grade Center.  

New students who never used PointSolutions Mobile at UH

You need to follow this tutorial to create a PointSolutions account and purchase or redeem a subscription.
How to create PointSolutions account

Current students who used PointSolutions Mobile before

You already created a PointSolutions account and registered Clicker/Subscription.  All of your Account information will be copied from previous semester automatically. However, you need to login your PointSolutions account to check if your subscription is still valid and LMS connection. 
How to check your PointSolutions account