Try using Imgur, it's what most people here on the forums use. Use the code [img*][*/img] with the picture link. You can get the share link when you upload the photo to Imgur, and then go to the top right corner of the picture, hover over an arrow and in the dropdown, select "get share links" and copy the forum code and there ya go.
This is the code:
[img][/img]
You copy the image link between.
Example:
[img]^photo link^[/img]
I suggest using Imgur.com for uploading photos.