1. Start by selecting the 'Settings' option.

2. Next, choose the 'Custom Fields' section.

3. Then, tap on the 'Add Field' button.

4. Afterwards, select the 'Single Line' button.

5. Proceed by clicking on 'Next'.

6. Provide a name for your custom field.

7. After, choose object from the drop down field

8. Continue by selecting one option under Group's drop down list

9. Next, provide Prefill Value

10. Next, fill in Placeholder Value

11. Then, click 'Additional preferences'.

12. Provide a unique key for your custom field

13. Then write a description.

14. Finally, click 'Save' to confirm.

15. Custom Field successfully added!

