1. Install the Amethyst app: https://play.google.com/store/apps/details?id=com.vitorpamplona.amethyst

2. Get your current private key.

If you're using iris.to , Go to Settings -> Private Key and Copy Hex

3. Arrange to get that key to Android amethyst.

The safest, but most painful way is to paste that Copy Hex value into a text editor on your computer. But you might have other means such as emailing it to yourself, file synching, Google Drive, Cryptpad, etc

4. Start Amethyst and enter that private key. On the startup screen, you’ll be asked for your private key. Enter your key (either manually by looking at it on your other computer) or paste it from an email or file.