We don't currently have a free plan, so this is not possible.
How do I add more admins?
This document walks you through adding admins to your account.
How do I see which plan I'm on?
To see which plan you're currently on:
- Click the icon in the bottom left corner
- Click General -> Account, billing, and usage. You'll see your current plan and number of admins listed in the middle of the page. (to access this information you will need to be signed in as the account owner.)