After you finish creating your email signature, click “Save and Install” button under the signature preview:
Or if you have saved your signature priorly, hover over your signature on the dashboard and click “Use” button.
Select the Other option in the list of email clients.
Scroll down the Signature Preview and click the “Copy and Proceed” button which will save the signature code in the clipboard.
Go to the lower left corner and click on the image of your account and then choose Settings:
Then choose Accounts, go to the account you need and paste your own signature there:
The last thing is to ensure it is saved:
And now it's time to send an email.
We are done!
Your signature is ready. Enjoy!