In the first section on the left you must enter an example IP: 192 168 194 just below the number 194 in the box put 195.
The program will scan all IP addresses from: 192.168.194.0 to 192.168.194.255 if you leave the default ports it will scan 6144 addresses
you can also delete some ports, the ip will be less.
Still in the first section on the left, click on "Create IPList"
the program automatically generates the IPs.
In the second section (central) click on "Generate IP Port"
The program automatically generates the list of IPs with relative ports that you have chosen.
In the third section on the right, click on "Import List" you will notice that nothing happens except that to the left of the key the numbers of the IPs to be scanned will appear (in this case 6144) click on Start. The program is not very fast, so be patient ;-)
Greetings