How do I go about posting pictures and my signature picture....?
Click "Profile" on the men bar at the top of the forum. Then explore the menu on the left side to see all the things you can configure including the photo that appears in the left column when you post.
For posting photos in general, I see you have found that. Good looking bus there.
Another method for posting photos is to use a free Photo Bucket account ( www.PhotoBucket.com
). That has the advantage of not being limited on size and quality level of the photo. Photo Bucket will automatically size it to the setting you enter in your Photo Bucket account. It also has the advantage of being available for you to use on other sites as well or to share with people via email.