congrats on getting the new TT. may you have many happy memories in it. I take it from the title of the post you are asking how to get the pic in the signature?
Type the following - replacing ABC with IMG
[ABC]url-of-your-pic.com/specific-pic-location[/ABC]
you should probably use something like photobucket.com to host your pic, then grab the url from there. When i did that and tried to copy the url directly, I found there was some miscellaneous information just before the name of the pic that I had to remove.
Good luck and Happy camping!