So the photo is a digital photo and you have it in an album on your computer?
If so - klick this link ->
http://www.abload.de/ <- it is an online picture hoster that will store your pic 'on the internet' itself, so it shows even if your computer/album is offline.
There is a button in the middle - "Durchsuchen" (search) - klick it.
A window opens and you have to navigate to your photo.
(If you have trouble with this - copy your photo to your computer desktop first and then klick the link. The window will show on the left side "Desktop" - that is your desktop and there you can mark your photo for uploading it. You may have to scroll down.)
Now hit the button "Abload" and the photo will be transfered. It may take a few seconds.
You will be directed to a second site - reading Upload fertig (upload ready).
Scroll down and you will find your photo next to a table with several URL addresses.
Klick on the provided
direkt link address htt ps://abload.de/... - it shall change into blue. Now rightklick the blue link and copy it.
Save it to a text file - notepad/editor/word document - whatever.
This is the URL address (
http://) you have to put into your signature as decribed above by Von Due.
Overwrite the complete image link so there is no double "http://https.//..."
Then preview your signature and save.