My husband worked for himself before he was disabled, and it is asking for an (EI) Employment ID, and we don't have one. What do I do? I paid already to file my return.

Are you including his self  employment income on your joint return? If so use his social security number as his business tax number. 

Where is it asking for that?  Do you mean a EIN?  What are you trying to enter?  Does he get Social Security disability?  Did he get a SSA-1099 form?

If it's asking for an EIN number you are entering it in the wrong place. There is no EIN on social security SSA-1099. Delete it and enter it here,

Enter a SSA-1099, SSA-1099-SM or RRB-1099 under

Federal Taxes (Personal for Home&Business)

Wages and Income

Then scroll down to Retirement Plans and Social Security

Then the second line - Social Security (SSA-1099. RRB-1099) - click the Start or Revisit button