@Phil *****
from your embassy you need a notarized right to marry letter, that has three options, single never married, widowed, or divorced. You need supporting documents with the last two, final divorce papers, and a death certificate for widowed. After you get this document notarized from your embassy you must have it translated into Thai, and that translation certified by the ministry of foreign affairs as being accurate. You take these documents, with copies of your passport pages and your passport, copies of your new wife's Thai ID card, to the local Amphur to get legally married and have it registered. It is one process. You also need two witnesses. Some offices require getting an appointment, and some don't. Some might also require that your passport is notarized by your embassy as being real. The right to marry document is required at every Amphur. That is the most time consuming item to get, but once you have that everything else is very easy. Check with your local Amphur of what they require specifically.