In the WordPress Admin, go to Settings > Sign-up Sheets Under the heading “Sign-up Form” and then ”Custom fields” you will find a row of fields with headings like “Name”, “Slug”, “Type”, etc. Enter the text “Comments” under the field in the Name column Under Slug you can leave it blank and it will be automatically generated. Or you can enter a value you want. This is not displayed on the front-end, but just identifies the field in the database. Under Type select “Textarea” Leave Options blank since this is not needed for a Textarea. However, if you are adding Checkbox, Radio or Select options you can enter each new option on a new line and they will display on the front-end Under Sheets you can select “All” to display this new Comments field on all sheets or select one or more existing sheets if you only want it to display for certain ones. Click the “Save Changes” button at the bottom Confirm by going to your sign-up sheet on the front-end and clicking the “Sign-up” link to view the form. You should now see a Comments textarea added to the bottom of the form. Learn more about custom fields