Need brief description on how to fit these to my Kawasaki VN 900

Please forgive me if this is a strange question, but did you charge the new battery?

my kawasaki vn 900 is making a chattering sound when I try starting it

The VIN decoder info is below. Since the Vin shows it to be a VN900B, the bike is the "Classic" model. Please rate my answer. Thanks.

Bad switch,Bad relay,bad solenoid the solenoid may need cleaning.
For troubleshooting remove the positive wire from the starter.
That is the biggest one. on the starter.
Now place a load on the wire say a headlight or 12 volt fan

the oil level on my 09 vulcan 900 is 3.2 liters and you check the water level under the side panel.

possible reg/rec issue or the stator....if you have a multi meter you can check the stator by unplugging and hooking up to the stator (component side), set multi meter to volts a/c and connect each plug for voltage. then do a residence test on the stator.
reg/rec issue, make sure you have proper ground, do a diode test to make sure that it is d/c and not a/c

It's your drive belt if this is a 900 Vulcan... They make noise when they are wet... Good Riding!

WIX Part # 51358 should fit.