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Addition of client on redundant Servers in 800xa Ver 5.1

I have redundant servers and 2 client PC so i want to connect one more pc as a Operator 3 in network. My question is that after normal installation like single engineering node how i can proceed for addition of client and to make a operator workplace for operator 3. Please help.

Thanks in advance.
Software ver - 800xA ver 5. 1