This is how you can update existing custom fields.
1. Log into your portal as Administrator. Go to ‘Account & Settings’.
2. Basic settings tab, scroll down to the ‘Custom Fields’. Choose the custom fields you want to update. If you want update custom field for course, click on the ‘Custom course fields’ or if you want to update custom field for user, click on ‘Custom user fields’.
3. Click on the pencil icon under the ‘Option’ column. You can also delete the custom field by clicking on the ‘X’ button.
4. Make a change accordingly. You may want to modify the name, type or you can also add more items under the dropdown list.
5. Click ‘Update field’ to save your changes