Here is the method to open the Income Tax return in IRIS.
1. If you already Enrolled with fbr then login with you User Name And Password otherwise enroll your self with fbr first (for indviduals CNIC is User ID and For AOP's NTN is User ID.
2. Now go to Declaration tab on the top left side of the page and open the 114 (1) form (return of income filed voluntarily for complete year)
3. Now click on the Period and enter the Tax Year of the Return which you want to file and press enter.
4. Now select the Tax Period and You INCOME TAX RETURN FORM will open.
Now just fill your return and submit it. 


