Hit the appropriate URL with your browser. Only the person who configured your webserver can tell you what the appropriate URL is.

If you're wise enough to be using CGI, you should also be able to simply run your script and see some output:

your_command_prompt$ perl /test012/home/PikK45/CGI/1.pl
[download]

Whether or not your web server actually invokes the CGI script at the path where you put it is dependent on how the server is configured, and that's probably something you will have to ask the administrator about (or possibly read the instructions in your assignment again). This isn't a Perl question. It's a webserver question.