read this little article
and when you get to the part about adding another directory after the colon : you will add:
if that is in fact the directory structure, although i can't see why you have two msn directorys .... but if that is how you got it, then thats what you will add ...
and if you did want to make a symlink to amsn in your home folder, then while in your home folder (/home/piresl) you can type :
ln -s msn/msn/amsn amsn