Apply for visa here https://esta.cbp.dhs.gov
also, I'm pretty sure DUI isn't going to stop you from being able to enter.
Also everything I have quickly read over this morning looks like you will have to say YES to the first question, asking if you have ever been charged for a crime or whatever, but it also states just answering yes doesn't mean you will be denied.
The worst that will happen is you will have to go and apply again in person at a US consulat. Keep in mind, that if they want to be pricks about it, this can take upward of 2 months .. they can do a full background check on you etc and take copies of your fingerprints. So, if you want to go any time soon you better apply ASAP