Can I change my Symbonic subscription plan?

Answer 

Yes, Symbonic makes it easy for you to be in control of your current plan.  Locate your account name in the upper right corner of any page on Symbonic. Click the drop-down menu and select Account Admin and then select Plans & Billings on the far left side. Next, click Upgrade Now at the bottom of the page.

From here you can upgrade your plan accordingly. Make sure that you have the correct plan with the correct amount of seats that fulfills your needs.