Why can't I click on it to zoom? I can right click and open in a new tab, but what did you do differently? - oh, did you just post a link and not upload the picture?
You don't need to actually upload a picture to dprevived to make it clickable and open in a new browser tab.
As long as you have the url to any image on the www you can "hotlink" the image to a post here on dprevived and it will be clickable and open in a new tab.
See example code at the end of this post.
The reason it's not clickable in your post is because you inserted the url to the image in only an [img] tag.
The url inside the img tag is just the path to the image to be displayed. The url inside the img tag does not make the image clickable.
A url tag makes text or an image clickable. The url inside the url tag tells the browser where to go when the image or text wrapped by the url tag is clicked.