Subscription upgrades can only be performed by the Account Administrators of your Freshdesk account by following the steps below.
Navigate to Admin from the menu. Under Account, click on Plans and Billing.
You will find the different plans and the provision to specify the number of agents. Select the "Choose the plan" option to proceed with your upgrade.
For online payments using a credit card, check your order summary, account, and billing information, and provide your credit card details to complete the payment
For offline payments please reach out to billing@freshdesk.com and support@freshdesk.com with your plan upgrade details.