As you want to take the application print out of your Tamil Nadu Public Service Commission (TNPSC) and asked for the steps to do it, I am giving you information for that

Go to TNPSC website
Click on Apply online, the page open look like



Here you will find various exams like
Librarian in Tamilnadu Public Service Commission.
Deputy Manager-II in ELCOT.
Assistant Jailor in Prison Department in the Tamil Nadu Jail Subordinate Service
General Foreman & Technical Assistant in the Tamilnadu Motor Vechicles Maintenance Sub Service
Tester and Assistant Tester Tamil Nadu Industries Subordinate Service
Block Health Statistician

Choose your exam
Click on Application print
Enter your Login ID and password
After that you will be able to print your application form.