Once you have the Mailock App installed, open the email message using your mobile email client, then tap the link Read my message.
On Android, the “Complete Action Using” box may prompt you to open the link, choose the Mailock App.
The App will launch; simply sign in by entering the email address and password that you used when registering for the Beyond Encryption account. You may need to answer the challenge contained within the email to access your secure message. The Mailock secure email will then be displayed: