You have to resize the pictures from your digital camera, various sites can do that, just do a google search on ''resize images online'' . make sure you resize them so they will become 100 kb at most... then, you save the new resized picture on your computer and attach it to your post!
Otherwise, just register with an image hosting page, again do a google search, and upload the images on your account. Then, copy paste the codes for each image that the hosting page will provide you on the post...