or

you can copy the url

select it with your cursor
and go to edit hit copy

then go to the post area

and put this string of characters [img] at the begining then go up to edit again and click on paste then put [/img]at the end with no spaces between the url ond those boxes


here is an example

[img]http:/www.blankblankblank.com[/img]

i left out the other slash / so you could see