Actually, most of us on the forums don't much care for the Limewire player. However, if you want to use the LW player, go tools...options...player and select 'Use Limewire Player'.
If you want your songs to be in your shared folder and play them through LW, go tools...options...sharing and add the folder that contains your music.
Hope this helps
Dan
P.S. Why do you claim things like 'help needed fast' and 'I've lost all my songs' when you really didn't lose your songs and the only trouble you've experienced is having to have WMP open? It doesn't sound like a disaster to me.