is every pin of raspberry pi 3 model b can be configured as PWM ?
if yes how we use it possible?
Basically the answer to your question is 'no', and the longer answer is 'maybe, but only in software', and it's possible using Python.
from the link it says two pwm channel are used for raspberry pi 3 model B.
What are your requirements? If you're happy with it being slow and having some jitter then bit banging means it's possible on every pin. If you need critical timing or high speed then you're out of luck. There are of course add-ons that will give you more high quality PWM outputs.