unable to configure OPManager to detect using SNMP the switches

unable to configure OPManager to detect using SNMP the switches

I have this problem with OP Manager.  I  have already entered the RO and RW credentials to the switches
but OP Manager cannot detect this.

What appropriate Credentials must I use as well in OP Manager?
It asks me for the following:
Username
Password
Command Prompt
Login Prompt
Password Prompt
Port Number:  23
Connection Protocol: Telnet

I'm not entering this info when I' Telnet to the switches (only the password).

Hope you can assist.















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