Are you trying to place your logo as a watermark on your photo?
Protect your work! I’ve seen it before, thieves downloading someones photo and putting it on their website or social media page to display it as their own. Not only that, they can also crop out your logo! You want to make sure that your logo is placed on all of your photos displayed online and you also want to make sure that your logo is located to where no one can crop it out.
Here's an example
How to get a transparent background for my logo?
The graphic designer who created your logo should have sent you a .PNG file of your logo. If you are trying to use a .JPEG file, you will NOT be able to get a transparent logo for your watermark with this file. You will need a PNG file that does not display a background.