The signatures for your sending accounts can be configured from the account settings. You can add the signature for each email account in accounts settings, and then import it into your email with the variable {{accountSignature}}.
Here are the steps to add signatures for your accounts:
1. Go to the Accounts dashboard, click an email account to open the account settings. Here you will find the signature editor.
You can edit the signature as per your liking. If you'd like to add an image to your signature, we suggest you read this article on how to do so with Google Photos and Labnol.
2. Once you add the signature for your accounts, you can insert the signature into the email copy using the variable {{accountSignature}}. Go to your campaign sequence editor, and click on the Variable button:
3. Select Signature variable