Depends.
If I wanna put some review pics, humi pics, whatevers, I just go through a photo-hosting website: Photobucket. It's free, less hassle than loading pictures on this forum.
Once you load a pic on Photobucket, use the URL of the image to place it in your post using the "IMG" code tags. Or some places, like Photobucket, will give you an "IMG" code automatically. Click on it, copy it, then paste it in your post.