Revealer software comes as a plugin for Electrum Bitcoin Wallet since version 3.2. If you still don’t have Electrum, download it from the official website https://electrum.org
Once running Electrum, go to ‘Tools->Plugins’ and activate the Revealer plugin:
Then you can see the revealer icon on your seed dialog:
Clicking on the icon you will get to the Revealer setup dialog, where you can type your physical revealer code, or create a digital one to print out yourself:
After typing your code, the next button will become active and you will get to the encryption dialog, where you can encrypt your wallet seeds or any custom alphanumerical secret.
Once your secret is encrypted, it will show you the path to your files, and open the pdf:
The encrypted seed looks like this:
Now you can print it out.
Always test your backups!