[Shirazmn]

Yes, i did it. The only picture i upload is the avatar, but no others at posts.

Have another look at this image with Instructions.
https://www.breastnexum.com/attachment.php?aid=16662

Be careful in step 2 -> 4 . Many people find it confusing that uploads have to be submitted in separate steps. 

Since you mentioned the 200KB, I assume that you already used my resize tool to prepare the images for upload. If not, here it is: http://tgclassified.com/resize/index.html

Don't forget that some themes on this forum have troubles with file uploads.
If the image upload still doesn't work, go to User Control Panel (User CP) >> My Profile >> Edit Options >> Other Options >> Board Style
and choose a theme OTHER THAN "Mod Blue" or "Mod Rose".