Follow the instructions in this article to create your custom fields. 

1. Navigate to your profile icon > Contact Custom Fields. 

2. Select add a new Contact custom field.

3. Enter a name for your custom field then select next. 

4. Enter a Key name, for example: name_of_field. Then select next.

5. Enter a short description (optional). Then select next.

6. If you want to organize your fields, enter a category (optional). Then select next.

7. Select the option Show in contact form if you want to enable individual contact imports to include this field. Then select next.

8. Select a type of field, such as text or date, depending on the data. Then select next.

9. Done! Your Custom Field has been created successfully.