Where would I find this field to change?

[maryr]

Screen shot 2011-06-05 at 7.09.51 PM.png (25.89 KiB) Viewed 24 times

[Cristián Lávaque]

Are you using the Free Registration Pro-Form? You can edit the desc (description) shortcode attribute. WP Admin -> s2Member -> PayPal Pro-Forms -> Shortcode Attributes (Explained)

If you mean WordPress' normal registration page, you'll have to edit wp-login.php.