I checked through your post history to see your replies containing images and all seem valid (uploaded) to me.

If you mean directly showing the images in your post, the link that you should copy is the direct link to your image with the extension (.jpg or .png / etc.)
In imgbb, you'll get the link by right-clicking the image and selecting "Copy image address" if your browser allows it, then insert it inside [img][/img] tag.

Alternatively, both imgbb and talkimg provide BBCode containing the image. (scroll mo sa baba)
You can directly copy and paste that to your post.