Custom fields are extra questions you can ask your users during registration. By default, Strongest includes a custom field for athlete shirt size.
To get to the Custom Fields tab from the competition dashboard:
Select the “Manage” button on the competition you want to add/modify custom fields for.
Select the "Advanced" tab in the side bar.
Select "Custom fields" sub-tab in the side bar.
From here, you will see all the custom fields you have created for the competition. You can delete any custom field by selecting "Delete", circled in red in the screenshot provided. Please note that deleting a custom field will also delete the data associated to it, so please do not delete anything that has data you require.
Need more information on setting up custom fields? Check out this article.