This is a regularly asked question (I also asked it when I first started).
There is lots of discussion in the "Help - how to use the site" forum, from which you can see how to load links from photo sharing sites like Flikr.
I think this is Paul's last announcement on the subject. It's worth reading carefully, because one can waste lots of time if one is one of those idiots that doesn't (sadly I'm one, and learned the hard way
)
http://www.walkhighlands.co.uk/Forum/viewtopic.php?f=18&t=1159