To access and manage your PPCnerd user account, just click on the PPCnerd Smart Menu Add-On, which you can install from the Google Workspace Marketplace. The PPCnerd Smart Menu add-on has options to allow you to manage your user account with us such as updating billing details and managing your subscription.
Just be sure that the customerId field on your control center sheet has the correct customerId for your Google Ads account, as the PPCnerd Smart Menu looks up the Google Ads customerId from our systems for billing details and subscription management.