I find that on Android phones (this problem may exist on other types of phones, but since I don't own one, I can't verify this) creating or editing a Wild card is impossible, as the "Confirm" button is so far to the right that it is off the screen, leaving a sliver of a button visible, but not big enough to actually allow you to hit it. Rotating the phone doesn't help, as it just keeps the same framing and increases the resolution. If the Confirm button were left-aligned rather than right-aligned, that would probably be enough to fix this.

Thank you for your help.