Regarding Access of Prism Central Access, I have try to access but no luck and also please guide me the step to access the CLI of CVM

Prism Central is access via https://<PC_IP>:9440 and logged in default with admin Nutanix/4u (Yes capital N).

SSH to PCVM is nutanix nutanix/4u or your admin user. 

is this your production or test environment?
do you have the Prism central installed?if yes, what is the issue you are facing?
for default credentials you can refer to what ​@JeroenTielen  has mentioned.