Also, the "Legi** challenge your peers - win D**" text wasn't written to the image (shoes), it's an overlay.
Just do this instead (! if canva allowed you to !):
- Open the banner in full screen, then "print screen" (W10:Print Screen/W7 or others:Ctrl+PrintScreen)
- For W10: Go to the Screenshot folder, usually under Photo Folder.
- For W7: Get any random image and edit it using Windows Paint, then Press CTRL+V to paste the copied (CTRL+PrtScreen) image, save.
- Upload it to imgur or any image sharing site, and get the direct URL that ends with an extension.
- You can now post it to your thread.
BTW, for the OP (and other newbies), after pressing "preview" and saw that the texts are in the right format (excluding the images) you can just proceed and post it.
Now visit your profile page and click "Show the last post of this person" and your post should show like you're a Jr.Member+ with the images displayed (just in that page / given that you've linked the right format).
You're a copper member now, this wont make a difference now.