You can send a link to the workrest app directly from your personal account.
To do so, when you're next logged into the workrest app:
Click on the workrest logo at the top left of the screen
Tap on the "Invite Others" button
Select the contacts you want to invite
You can also send the invite to a group chat
The contacts you invite will receive a link connecting them to their applicable app store (IOS / Android - this is set based on the recipient's device).