In Recruity Professional you can add custom fields to:
- Contacts
- Companies
- Appointments
- Tickets
- Invoices / Orders
- Jobs
When we create a category "My information" to the contacts this will look appear like in the following screenshots:
The edit screen:

You can add the fields to the grids:

View the fields in the information panel:

To add custom fields go to:
Start menu -> Custom fields
Add a category first. Click at Manage categories -> Add to add a category.
After the first category is created you can add the fields.
Permissions
For a user to see the custom fields created, make sure the user has access to the module "Custom fields" and has access to the custom field category at:
Custom fields -> Manage categories -> Doubleclick category -> Permissions