If you're on an Insync Pro or Business license, you'll have to add other accounts to your license to take them out of the free trial. To manage your Insync account, simply head over to the Insync homepage and click on the upper right Pro + Business login button.
Once within your dashboard, click on the person icon tab to add your additional Google accounts.
To add more consumable accounts to your subscription, please go to the subscription tab and press the + button to increase the amount. When satisfied, click on update subscription.