After you install the GNS3 and the SupperPuTTy on your computer, locate the SuperPuTTy folder mostly will be at: "C:\Program Files (x86)\SuperPuTTY\SuperPutty.exe". On gns3 go to edit, preferences. Under general, click on Console Applications, as you see below.
you need to specify the location of the SuperPuTTy and the protocol to use as below:
"C:\Program Files (x86)\SuperPuTTY\SuperPutty.exe" -proto -telnet "%h -P %p"
After that, go and open SuperPuTTy application and set the following settings:
Select
Only allow single instance of SuperPuTTy to run as you see in the above picture.
and on GUI tab, under tabs and docking set tab text to dynamic , as you see below on the picture.
and have fun!