How to make another servers from pool of server of WVD tenant as session host?

We have created host pool there's a session host attached to it. Due to RDP issue we are unable to connect the session host, however running the PS can see the session host is running fine as expected. However we need to add another server as session host in same host pool. 

Procedure ideally I'm looking is like what to stop, what to run PS command to remove, what next PS to check requisite and the what/when have to run for another session Host to add Host Pool.

Any help will be much appreciated !!