Actually, it is quite easy to send a chord chart by email on iOS devices:
+ Open the chart you want to send. Touch the share icon (a square with a vertical arrow) on the upper right side of the screen to reveal a menu.
+ Touch "Share Chord Chart". This reveals another menu.
+ Touch "PDF."
+ A screen with a number of choices is presented. Touch the "Mail" icon.
+ Doing this opens the Mail app with a message already created with your chord chart attached. Simply type the email address of the desired recipient on the "To:" line and send the message.

That's really all there is to it! I would guess that Android devices use similar steps.

Good luck!