You can't share the actual "Trip" itself and it's details but you can share your driver scores through Leaderboards -> Friends Leaderboards -> Invite Friends

The only ways to share the actual "Trip" details itself is to:
  • Go to Data Export, receive the email, then forward it on
  • Tap on the Trip card, then tap on the Share icon at the top right. A csv file can be shared to your friend from here