2003 disco leaking fluid from under driver's side
 

Looked under car today to see where leak was coming from and the steering parts are wet. Leaking steering fluid?

Pictures from under the driver's side.

put some uv additive in and find the source.
my guess= return line or the pump

After I take out the p/s fluid with a turkey baster, then do I add the uv additive in or keep the p/s fluid in and add the uv stuff.?

Just top it off with the additive.
Only takes a tiny bit and the pump will circulate and mix it