Firstly, you need to get session id with the permission to access the database.
To get it, you can simply click the Login button in the first page of the database.
Once you get the session id from the cookie data, please copy and paste it on the source code.
Then, please specify the keyword that you want to count articles for.
You are all set. Please just execute the program and it will print the progress of the procedure. Once it finishes, a csv file will be added on the same directory.