- Join Haunted Soft β community in Google+.
- Visit join beta testers page in Google Play and follow Google Play instructions (if you miss step 1, you'll see error 404 - page not found).
- Uninstall app, and than reinstall it again.
Disclamer: β-versions may be instable and contain some bugs, that will be improved in stable versions, released to all users.
If you want to leave beta testing, at any time visit beta testing page in Google Play and follow Google Play instructions. Than uninstall β app, and install again (stable version will be installed).