Yes, advocates, attorneys and representatives can fill out the application for someone else.
Yes, I need someone to help me fill it out.
You can have someone help you.  There are a few things they will need to know.
Are medical requirements the same for SSI and Disability?
Yes, both programs have the same requirements for medical.
What kinds of things do you ask?
We need information about about your medical, work and educational history.
What does the disability planner do?
It tells you how to qualify and apply for benefits and tells what to do if you're approved.
How do I know what will happen if I go back to work?