Here's how to do it:
- Log In to Dropbox.
- Click Continue.
- Click on your avatar profile (or initials) in the low left corner.
- Click Settings.
- Go to the Refer a friend tab in your account settings.
- Copy and paste your custom invite link.
- OR, Enter your referral email and click Send.
- When a referral creates a new account, you both receive extra storage.