[King of Snake]

in the user list on the upper right hand side, right click and "add user"
Then you can right click the users name (if he's online) and click "browse files".

And using Soulseek doesn't get you viruses just like that. You could have the bad luck of downloading some contaminated file but I don't think I've ever encountered one. Of course it's always a good idea to check with a virusscanner from time to time.