How do I make images of users appear on the left in my forum?

http://fjsama.forumotion.com/ When users post in my forum their images appear on the same level as their text, how do I force the text to show up on the right wrapping around the image like this. https://2img.net/h/i192.photobucket.com/albums/z246/Hiuxing/question.png

I want it so that whenever a user posts it does that, also to save room; can I also ask how to force images to meet a certain size? I don't want images to show up bigger than 250x250.