How to join between program of what's app if beta is full

Hello,

WhatsApp Inc. has invited you to a testing program for an unreleased version of the WhatsApp Messenger app. As a tester, you'll receive an update that includes a testing version of the WhatsApp Messenger app, which may also include unreleased versions of its instant app.

Note: testing versions may be unstable.

CLICK BETA TESTER https://play.google.com/apps/testing/com.whatsapp