Just follow the instructions here.

TeamTools is free for the first 50 users! Subscriptions are based on a quantity that corresponds to additional blocks of 50 users. So if you have 75 or 100 users, your subscription will be for a quantity of 1; if you have 125 or 150 users, your subscription will be for a quantity of 2.[…]

Just log in and follow the setup prompts. You can also get an overview of the steps here.

TeamTools is for teams using Google Workspace. TeamTools uses the Google Directory you have already configured to provide useful and easy-to-use tools to your employees or staff. All the below features support full search, as well as filtering by group. Photo gallery Customizable table with export Timeline Calendar with birthdays and anniversaries Customizable org chart[…]