The first step - please verify what distribution code is reported on form 1099R that you received.
If the administrator of your IRA reports on form 1099R, box 7 - distribution code "3" - Disability - there no need to file form 5329
If the administrator of your IRA reports on form 1099R, box 7 - distribution code "1"- you do need to file form 5329 - http://www.irs.gov/pub/irs-pdf/f5329.pdf
How to file form 5329?
Line 1 - Early distributions included in income - from form 1099R line 2a.
Line 2 - Early distributions included on line 1 that are not subject to the additional tax - put the same amount as on the line 1.
Enter the appropriate exception number under line 2 - for disability - use "03"
Line 3 - Amount subject to additional tax - enter zero.
Line 4 - Additional tax - should also be zero.
You do not need to enter any additional lines.
Be sure to sign the form at the bottom.
Attach form 5329 to your tax return
Let me know if you need any help.
Be sure to ask if you need any clarification.