Where do I enter pension plan contribution if I'm self employed

Did you receive any forms relating to this? For example, any 1099 forms?

1. Sign In - Continue your/take me to my return
2. Go to Federal Taxes (or Business, if shown), then Income & Expenses
   
3. Edit/Add/Update Self-Employment/Schedule C Income/Expenses
   
4. On the page titled Here's the business info we have so far, Add/Edit business/income items  
   
5. Next page is titled Your .... Business. Go to Other Common Business Expenses and start/edit Employee Expenses. You'll enter contributions to pension plans here.