Click on Setting > Discovery to go to the Device Discovery page.
Under Discovery, choose IP Range (By default it is selected) to specify the range.
Start IP: Specify the IP address of the device in the range from where OpManager should start discovery.
End IP: Specify the IP address till which OpManager should discover.
Click on 'Add' button. You can also add multiple range of IPs in a single discovery profile.
Select the correct netmask.
Select appropriate credentials from the list of available SNMP credentials. if the credentials are not pre-configured, you can always use the Add Credential button to add new credentials.
Enter schedule parameters if you want to run this discovery profile periodically. (Optional).