Legal analysis: Shenzhen Industrial and Commercial Bureau can sign with U shield. First, you need to install a PDF reader, then open the PDF application form file that has been downloaded to your computer, and then insert the signer's digital certificate (generally referred to as a U shield) into the computer, click the signature field marked with the signer's name and ID number on the PDF, click Sign in the pop-up dialog box, enter the password of the digital certificate, and click Save to successfully sign the electronic signature.

Legal basis: According to Article 19 of the Civil Law of People's Republic of China (PRC), minors over the age of eight are persons with limited capacity for civil conduct and are represented by their legal representatives or recognized and ratified by their legal representatives; However, civil legal acts that are purely beneficial or suitable for their age and intelligence can be implemented independently.