Here is the step-by-step process:
Go to one.zoho.com and log in with your credentials.
On the left-hand sidebar, click on More Apps.
You will be able to see the apps you currently have and the option “Unassigned Apps”
You will see a list of all available Zoho apps (e.g., Zoho Bookings, Zoho Sign, Zoho Projects).
Find the application you want and click Add.