Quick Instructions
click the skin sample you like
save the .exe file to a place you can easily get to
double click to open/run the .exe program.
Follow instructs, the skin will automatically be put in this location
C:\Program Files\Yahoo!\Shared\Graphics

To use the skins:
Open yahoo messenger > click view > change skin
then choose the skin to use from drop down menu > click ok
all skins by me have _bas at end of name.