Customize a petition template by downloading the template file onto your computer and opening it in Microsoft Word or Adobe Acrobat, depending on the file type. Enter in the name of your organization, the date on which you created the petition and the purpose of the document. Modify the signature section to include fields for all the data you wish to collect.
Begin by locating an appropriate petition template from TidyForms.com or SampleTemplates.com, and then check the file type to determine the program you need to edit it. DOC or DOCX files are word processing files and require Microsoft Word, which allows for direct changes to the text and formatting. To edit a PDF, you must use Adobe Acrobat, which may only let you write in text or move objects, depending on the file's creation method and the version of Acrobat.
Once you open the file, enter your name or the name of your organization at the top, along with the recipient of the petition. Beneath this, write a brief statement explaining the purpose of the document, why you are collecting signatures and what changes you want the recipient to make. The signature sections should contain spaces for a signature and the signator's printed name and ZIP code, as well as other relevant information.