Applying for a U.S. visa involves the following steps:
Go to DS-160 form (link given at the end) and complete filling your information. Do remember to save each page before you press on confirm. Detailed form won’t be available after confirmation and only the confirmation page will be available.
Note: Once you start filling the form, note the DS-160 form no. You can retrieve the form only using the number and the other security information you have answered.
Create a profile on US Appointment website (link given at the end).
Pay the fees in the Appointment website after completing your profile.
There might be a delay in confirmation of the visa fees in the website.
We documented our US Visa experiences including the list of questions asked in the Consular appointment here