I am having trouble entering anything for Box 2. On my W-2 it is blank! What do I do?

If box 2 of your W-2 is blank it means no federal tax was withheld from your pay by the employer.  If you believe  that to be incorrect, talk to your employer and have the W-2 corrected before you file a return with it.  Or it might be that you did not earn enough at that job for them to withhold tax, or that you claimed too many allowances on your W-4 and caused them to not withhold tax.  However, your W-2 does have to be included on your tax return, so once you determine if box 2 is correct, it has to be filed along with any other income you received.  All on the same tax return.