Hello, I am sorry I a, not really computer literate, but I had a normal blue background on my monitor screen and suddenly while looking into the websites I found out at my screen a photo of some beared guy I do not know and even less wqnt to have on my screen. How am I to get rid of the lad? Best. A very old person
More aboutmonitor screen picture
Welcome to the forum!
Are you sure you are not looking at a mirror?
I suspect someone is playing a prank on you by putting a gif as background or something more sinister...
Scan for virus and malware.
Or you can find a picture you like and when you are looking at it make right click on it and select "Set as desktop background" and it will replace the "beared guy".