You can upgrade or downgrade your Zonka plan anytime from your Web Panel account located at https://web.zonkafeedback.com.

Upgrading your Plan

Go to Subscriptions from the top right Account drop-down.
On the Plans tab click Change against your existing Plan name
This will open a Plan page which from which you can select the desired plan to upgrade to and click on Upgrade.
Next, you will be prompted with a pop-up showing the cost of the new plan and the total cost you will need to pay now to upgrade. You can also add/remove add-on locations at this point.
Click on Upgrade to initiate the upgrade process and your plan will be upgraded immediately.
You will be receiving a confirmation mail on your registered email id.

Downgrading your Plan

Go to Subscriptions from the top right Account drop-down.
On the Plans tab click Change against your existing Plan name
This will open a Plan page which from which you can select the desired plan to Downgrade to and click Downgrade on that plan
Next, you will be prompted with a pop-up showing the cost of the new plan and the total cost. You can also add/remove add-on locations at this point.
Click on Downgrade to initiate the Downgrade process

You can purchase additional locations as add-ons on top of your subscriptions.