For Live Site,
Log-in to your Chargebee Live Site
Click on the ”...” near your account name to the bottom left corner of the web interface
Click on the block that contains your profile as displayed below
You will be directed to the My Account page of Chargebee.
Click Manage Account to update your billing/account/payment information
Click Upgrade to move to a higher plan
For Test Site,
Login to your Chargebee Test Site
Follow the steps (2-5) as stated above
Click Choose Plan when you are done using the free trial and wish to upgrade.