You have to go to our photo gallery
http://www.custom4x4magazine.com/gallery/ first, If you are loged in in this forum it should have you logged in there too. You will have to use the "Create Album" function first. If you don't see that you are not logged in.
As soon as your album is created click the "Upload File" link. Then just grab the photos you want to post and go from there.
Please let me know specifially any problems you are having and I'll try to help.