You can invite anyone to sign a card by sending them a special link which is unique to your card.
Sign in to your account and click on the card's name on your Dashboard.
Next, click on the Invite colleagues button, which will display the Share Sheet.
To share the link by email or text message, click Copy to clipboard and paste the link in to an email. Add your own message and send it to the people you'd like to add a message to the card.
You can also share the link through Twitter, Facebook Messenger or WhatsApp by simply clicking on the icon, customising the message and sending it. This will open a new window in which you can customise the message, specify the audience, and send the link to them.