1. Open up their client file
2. Tap on "Forms"
3. Open the form you wish to send
4. Tap on the "..." in the upper-right hand corner
5. Tap on "Send copy"

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/7894d13a-f6b6-42d7-8971-61802b6ade85/Simulator_Screen_Recording_-_iPhone_11_-_2021-05-12_at_22.42.45.mp4