We eventually got an email with the instructions (P3.5, P4 they termed it) from the embassy, but we had to call them several times to get it. Our specific instructions included filing the DS-160 form and then emailing the embassy to let them know we had done so, and then given a link to check if there were appointments. (We had to follow up with them to get that response email too). From then it was just checking every single day to see if there were any appointment slots available, which they seem to do so during a short window once a month. That is the short summary of the process we went through. The longer one would say it's quite a frustrating process that you need to be very proactive with as the system does not seem to just flow through the expected steps and frankly anyone you contact for assistance displays no interest in helping you or caring about your case. It almost seems like a deterrent. But, like anything worthwhile, you persevere through the obstacles and keep your eye on the prize. Though we have the K1 wrapped up, we have faced other individual issues with the associated K2 visa so we're stuck in this step until Feb or March. At least after that we will be together while we continue through the next steps.