configure uplink ports as VC ports

Hello Juniper community 

how can I use the uplink ports 0 and 1 as a VC ports 

I know that the ports number 2 and 3 are by default the VC-port but my clients request to use the ports 

0 and 1 as VC-ports for his VC.

I have read alot of documentation but i didnt find an example of how to do it!

all i found is the command root> request virtual-chassis vc-port

but i dont know how to go from there.

and how to make the ports number 2 and 3 a normal Xe ports

I would appreciate the help and thank you for reading,