Blog - User Images

How can I add an image to appear in the posting user's blog post? I don't see the option anywhere in wordpress. There are a lot of plugins that are supposed to do this, but I don't know which one's will solve this problem, and not just let me add user images in the back-end only.

Hi,

I'm not sure what do you mean, talking about featured images? images from posts or you want to add images in the front-end? Could you explain better, or provide some examples?