around it.
Either click on the "Insert Image" button or manually ad the tags.
https://scontent-b-dfw.xx.fbcdn.net/hphotos-xpf1/t1.0-9/q71/s480x480/10366252_10203952835640020_8428589539056497322_n.jpg[ /IMG] (without the space before the /)
That will get you this:
[IMG]https://scontent-b-dfw.xx.fbcdn.net/hphotos-xpf1/t1.0-9/q71/s480x480/10366252_10203952835640020_8428589539056497322_n.jpg