Note: Make sure you are using either Google Chrome or Firefox during the installation process.
Create your email signature on NEWOLDSTAMP.com and follow these simple steps to install it into Mailbird.
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 Gmail icon in the list of email clients.
Under the Signature preview click the Copy signature button, which will save the signature code in the clipboard.
Open Mailbird. Once you are at the main screen, click the options button on the top left, and click on Settings.
From the left menu, click on Identities. Find your email account on the right, select it, and click Edit.
Paste your new email signature into the Signature section, and click OK.
Voila! Your new email signature is now installed. Test it out by composing a new email to make sure it looks correct.