Your best bet is to visit the PASS section of the ADEA website located at:
www.adea.org
PASS stands for postdoctoral application support service. It is essentially a clearinghouse for information. They will submit your essay, transcript, evaluations, and other pertinent information to the programs you designate that also participate in their service. This is similar to AADSAS for predoctoral students and they charge a fee for their service. Not all programs participate in PASS. They may have their own application. Many PASS programs require you have a Match number as well. Each program that participates in PASS has a "PASS deadline" by which your application has to reach the office in Washington to be delivered to the program by the "program deadline." The PASS website is fairly self-explanatory and I urge you not to hesitate. Some deadlines have surely passed and I found the most time consuming part of the application was getting evaluations. Professors complete these evaluations on your behalf as a courtesy, and it is hard to pressure them to get them completed rapidly.