If i am self employed where do add my rent for my station

Assuming you are referring to rent paid for your station, you will enter in the Rental Expenses category:

Type in business expenses in the search box, top right of your screen

Click on first category Jump to business expenses

You will arrive at the Here's the business info we have so far page

Click Edit

  Arrive at the Your Business page

Scroll down to the Business Expenses category

Click start or update next to Other Common Business Expenses category

Arrive at the Let's write off some business expenses page

Scroll down to the Rental Expenses category