Custom user fields can be used when you need additional fields for user information other than the basic user information provided.
1. Click on Setting > SERVER.
2. In the User/Device Management tab, click + Add on the Custom User Field.
3. When you’re done adding the custom fields, click Apply on the bottom of the page.
4. If you go back to the USER menu, you will see the additional fields in all existing users and also when you add a new user.