If you have more than one custom field to add, as Administrator you can upload custom fields through a CSV template. 

Here are the steps to create custom fields through a CSV template. 

1. Go to Admin > Custom Field > Select, Upload Custom Fields.

2. Click Download it here

3. Fill in all the necessary fields. Once done, save the template into your desktop,     then click Upload File.

Sample Template: 

Name Is the Custom Field Name
Enable
Enter 1 = Active or 0 = Inactive

To add a custom field manually see article: 

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