You may obtain a claim form here: Proof of Claim (National Bankruptcy Form B410)
Additional instructions for completing the Proof of Claim form also may be found at the above link. For your convenience the form is in fillable PDF format.
Attorneys and registered CM/ECF users should file claims electronically through the Court's CM/ECF system. Others may submit the completed form in person or by mail or overnight delivery to:
United States Bankruptcy Court
Western District of Pennsylvania
Attn: Claims Clerk
5414 U.S. Steel Tower
600 Grant Street
Pittsburgh, PA 15219
Note that claims filed in cases pending in the Court's Erie Division or Johnstown Division also should be mailed to the above-address. Should you wish to receive a file-stamped copy of the claim, together with an indication of the claim number assigned to the claim, please send in an extra copy of the proof of claim together with a self-addressed stamped envelope. The penalty for filing a fraudulent claim is a fine up to $500,000 or imprisonment for up to 5 years, or both. 18 U.S.C. §§ 152, 157 and 3571.
Any entity filing more than ten (10) claims in a calendar year shall file claims electronically in the CM/ECF system. W.PA.LBR 3002-1(f).
If you have any problems with the above links you may access the forms from the US Courts Bankruptcy Forms page.