1) Go to the top left corner of the main window and click on the Mailbird menu
2) Select "Settings"
3) Select the "Identities" tab
4) Double click on an identity to edit the signature
Adding an image to your signature
To add a picture in your signature just click on the "insert picture" icon. Please note that you can't upload an image from your PC yet, you need to upload the image to an image hosting website first. After that, just paste the location of the image file in Mailbird. Usually the link of the file location ends with the format of the image so for example https://bla bla bla.jpg
To get the direct URL, please use one of these free services:
You can also use Google Drive/Dropbox, the idea is the URL should be direct.
For instance, here's how you get the direct URL in Imgur: http://webapps.stackexchange.com/questions/95883/how-to-get-direct-link-of-images-on-imgur
Alternatively you can copy and paste any HTML from an online signature editor. These are some websites you can use:
Once created simply select all signature:
Then Copy it by right clicking on the selected signature and select "Copy" option or press Ctrl+c. And finally paste the whole html into Mailbird signature editor box.