How does one edit an SNMP Monitor?

How does one edit an SNMP Monitor?

I added three custom SNMP Marker Supplies monitors based on the printer MIB for a Dell B3465dnf printer.  At the time I was walking the MIB, I did not have the values to determine  which OID  related to Toner, Imaging Unit, and Maintenance Kit. I would now like to  Edit the SNMP monitor to show the correct Supply and Units.

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