You can easily upgrade your HouseCall plan from the billing page.
On your dashboard, click on the User Icon in the upper right hand corner of your screen to go to your Account Settings.
You will see the current plan you are on displayed. Click on CHANGE PLAN to view the other plan options available to you.
Select CHOOSE PLAN under the plan you want to upgrade to:
Then click NEXT:
Then review the plan and press NEXT again:
Lastly, you can change the billing cycle you would like in the top left corner, or skip that step and click UPDATE PLAN to officially upgrade to the new plan: