Expand the control by clicking the + icon on the left. You will see two fields. One is the resource name, the other is the session number. You will only need the resource name. You will put the full address of the instrument here, like "GPIB0::5"
Looking at the sequence file, you will need to put some value for the Session number. Put 0 in, and it should work. If not, please describe the error message.
hi, i had this problem too, but once i clicked on the + sign beside the "Visa Session" i could not edit the "Device Name" and the "Session Number". Please advice how can I edit the values.