If you are an ACT therapist and want to be listed on the site as such, please apply for professional ACBS membership, after you've logged in to your account. If you don't have a free account yet, you can get one here.
Only current ACBS members can be listed in the ACT Therapist directory. To do this, log in to your paid account, click on "my account" at the upper right of your screen, then "edit", then "ACT", then click the "ACT Therapist" checkbox and make sure that you've supplied information about your practice and ACT experience. Then just click "submit" at the bottom of the page.