Exactly below this, the next step has been mentioned. That is, you need to save the file (similar to what I have already explained which includes pressing Ctrl+X and saving the file) and then run the file which has also been mentioned in the previous modules.
You can refer to the below training module which includes all the commands in more practical manner.
Since this training module is much before the current module you have a doubt on, it is suggested to go through the training module and try to look for the solution of your doubt/query in the training content itself, before posting on the forum.
code is right, but just check the spelling of PLUS…cause its written ‘PLUST’(incase the output is not coming) n atlast ur can do ‘CTRL+X’ then Y’ and lastly press ‘ENTER’. Done…