So you want to help out and join the beta? Awesome!
To do, follow these steps below.
1) Open the Play Store on your Android device. Search for "Diplicity" and open the screen. You will see the screen below. Scroll all the way down (this picture is long):
2) Press the "Join" button.
When you now scroll up, you will see a message that you have joined the beta!
This will actually take a couple of minutes. Close the Play Store and come back to this page in about 5-10 minutes.
Then, the "Open" button has changed in an "Update" button.
Press "Update" and you now have a beautiful, new, Diplicity app!