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.

Hello ​@cha1 ,

Can you share the exact error you're getting when trying to access Prism Central?

For CVM CLI access, connect via SSH using:

ssh admin@<CVM_IP>

Make sure the CVM is powered on, reachable on the network, and that you're using the correct credentials.

If you can share your AOS version and whether this is a new or existing cluster, the community can help troubleshoot further.