If you wish to edit the email invite to support more text, currently we recommend using your email client to send the email.
Feature Request: engineering team will be prioritizing this feature on our roadmap based on customer feedback and will make it available in 2021. Please contact our support team for any updates.
Option 1
Copy the link when you create a session and send it using your email client (Eg. Google, Outlook, etc)
Option 2
Clicking Add Email from the Invite Participant will open the link directly in your email client