Sharing from an iPhone to Android should be very similar to the rest. You just need to follow these steps:
Open the digital card on your iPhone (the installed card).
Go to the back of the card (to access the back of the card, tap on the button that looks like three dots inside of a circle)
Then, Tap on the sharing button (it looks like a square with an arrow pointing up)
Once you tap this button, you will see the sharing options. We strongly suggest you tap on "Email", so you can share the digital card to the Android phone via email.
That should be it!