You can apply for SSD through your local Social Security Administration office or via the Internet at www.ssa.gov. The first step is to review the Adult Disability Starter Kit, which answers common questions about how to apply for benefits and includes a worksheet explaining what information you will need to start the process. Once you have gathered the necessary information, you can fill out the application online to apply. You must also fill out an online disability report, which includes information about your disability, your treatment, your health care providers, and current medications.