Can I still e-file if I amended my return before I filed?

When I filled out my information initially, I didn't think I was going to be getting the forms that I did and was told I would need to mail my return.  Before I did that, I got more tax forms and added them my filing.  Now it's telling me that I can't e-file because it's now an amended return.  How do I get it to let me e-file?