Go to the Microsoft Teams Store by clicking Store on the left navigation panel inside Microsoft Teams.
Find the Zoho Sign extension using the search bar, then click Install to add it to your Teams application.
Upon installation, you will be prompted to log in to your Zoho account to access Zoho Sign. If you already have a Zoho account, enter your Zoho credentials to sign in. If you do not have a Zoho account, use Office 365's SSO to authorize Zoho Sign within Microsoft Teams, then log in to your newly created account.
Upon logging in, you can start using Zoho Sign from within the Microsoft Teams interface.