Click here for a guide to uploading photos.
Note if you want to share your photos with people not on the forum you will need to host the image and post with image tags, a guide to doing this is here
Click here for a guide to uploading an avatar (the small image that appears next to your username.
Note that if you take a photo on an iPhone or Android phone in a portrait format you will need to rotate it before uploading, see these guides
for iPhone
http://osxdaily.com/2012/05/01/rotate-photos-iphone-ipad/
for Android phones
http://forums.androidcentral.com/t-captivate/52423-how-rotate-pictures.html