In the mobile application:

For iOS devices:

1. Open the Zoho One app on your mobile device, then tap in the top-right corner.
   
2. Tap in the bottom-right corner, then tap Admins.
   
3. Tap Add, then tap on the user who you want to add as an admin.
   
4. Tap DONE, then tap Done in the pop-up message that appears.
   

For Android devices:

1. Open the Zoho One app on your mobile device.
   
2. Tap in the bottom-right corner, then tap Admins.
   
3. Tap , then tap on or search for the user who you want to add as an admin.
   
4. Tap DONE.
   

In the web application:

1. Sign in to Zoho One , then click Directory in the left menu.
   
2. Go to Admins, then click .
   
3. Choose the required users by manually entering their name and searching, or by using the user picker ().
   
4. Click Assign.