tb5 you need to have the image hosted somewhere online first, this forum cannot do that for you.
Google image hosting for your choice or use your own ISP if you have access to hosting stuff online.
Once you have the image hosted somewhere, use the web link to the image in your post here with the code [ img ] insert your link here [/ img]
and no spaces in the image code tag I have above. Or use the insert image button and paste in your link