Set up your mailbox(es) using the Spark tutorial:

To set up your signature, simply go to the Preferences menu:

Select the "Signatures" tab:

Tick the "Activate signatures" box, then click on the + button at the bottom left of the window:

In your user interface, under "Email signatures", select and copy the "HTML code" displayed below the signature:

In Spark, click on the "HTML" button and paste your code :

And that's it, your signature is set, and will be automatically updated when you make any future changes.

**When you exit "HTML" mode, you can also add text to your signature.

And that's it, your signature is set up and will be automatically updated when you make any future changes.

Now you can test your signature by sending yourself an email BUT BEWARE that the link to your signature is NEVER active when the email is sent, only when it is received.