To e-file your taxes go to the File tab (on the left of your screen) and follow Steps 1 through 3, in order. As long as you are eligible to e-file, you will be able to e-file. You will also need your self-selected PIN or your adjusted gross income (AGI) from last year in order to e-file.
If you
don't have access to last year's tax return, you can request last year's tax
transcript from IRS.gov.
Your tax transcript will show your AGI (adjusted gross income).
When requesting your transcript from IRS.gov you
need to choose the tax
return transcript type when making your
request. Click
here for a link to IRS.gov's get
transcript page.