To set up your signature:
Access your account Settings (1) via the left sidebar
Go to the Signature tab (2)
Signature templates
Select one of the signature templates available and click on Save
If you want to start with a blank signature, click on No Signature, above the templates.
Personalization of the signature
In our editor, you can :
customize the text
insert hyperlinks and images (cf. article How to insert images and hyperlinks?)
edit HTML
Important :
We recommend you to use a signature without any images in order to increase your email deliverability (cf. article How to improve my email deliverability?).
Too many clickable links may disperse your prospects when reading your emails. Unless the link that is in your signature redirects to a landing page with a form, and that would be your call-to-action :)