You will need to go to a US Embassy for an interview to obtain your US visa. The closest US Embassy is in Barbados. You can fill out the application for the visa online, pay your $160.00 fee and finally make an appointment for the visa interview (in Barbados). You will need to prove to the Embassy Officer that you have strong ties to the country of your residency, as well as prove that it is very clear that you will not attempt to simply "stay" in the US. You will be asked all kinds of questions about terrorism, or course, but the biggest issues is to prove that you will not overstay your permitted annual time. With a 40% rate of people staying in the US after the expiration of their 90 day maximum stay, this is a hot button issue. Note that you will need to pay the fee before you schedule an appointment, can only change the appointment date a limited number of times, and the fee is non-refundable if you are rejected.