How I use 565 pll ic as a mixer?

 

You may not want to.

What is your desired output? ie. How have you set up your signals prior to needing mixing? And what levels are you trying to ultimately achieve?

 

This may help. This PDF does well explaining the part and contains a schematic.

However, depending on your application, you may want to consider a less ..obsolete.. ic.

www2.arrl.org/tis/info/pdf/0809071.pdf