Click the share button at the bottom of the card to get started:
A "Share Card" modal containing a form will pop up. Input the names or email addresses of the team members you'd like to share the card with. Once they've been added, click Share. Each person will receive an email notification containing the card you shared. That's it!
Note that you can only share the card with people who are part of your workspace. Admins and Editors can invite new people.