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In this YouTube tutorial, the instructor provides step-by-step instructions on how to add a permanent signature block to a PDF file. The first step is to enable all features if a yellow banner appears. Then, locate the "Prepare Form" option either in the right-hand side tools or under the "Tools" menu. Add the "Prepare Form" option to the right-hand side and also add the certificates for DocHub, prepare form, and fill inside. Once added, return to the document and click on "Prepare Form" on the right-hand side. Select the form that is currently open and click "Start Now." The video tutorial ends abruptly, cutting off the remaining content.