Attention : E-Visa applicants are no longer required to submit passports and supporting documents in person at the Royal Thai Embassy/Consulate-General. It is important to note that you are only able to apply if you are currently not in Thailand. After the e-Visa application has been approved, a confirmation e-mail will be sent to applicants, which can be printed out for presenting to airlines and Thai immigration officials when traveling to Thailand.
Click the "Acknowledge" button and you will be directed to where you can fill in the visa application.
This is becoming the norm for many countries now. Easier to do online rather that trying to get a paper copy and finding somewhere in the airport to fill it in, then cuing up to go through immigration.