This facility is already available for you just follow this steps:
While posting post please click on "I have to add some attachment" this option appears near SUBMIT button.
Attach the photo which you want to post.
After this it will give you three different html codings.
If you want to post large image then copy that line (code) and place the exact position where you want to post in your article.
Just take a lookout my one resource you will get an Idea about it.
BEST OF LUCK SIR !!!
"The road to SUCCESS
is always under construction"