To sign a contract on the Huaxia Sky novel website, one needed to provide a scanned copy or photo of the ID card because the ID card was an important document to prove one's identity. If you don't have an ID card, you can try to contact the website administrator to explain the situation and provide other relevant proof such as school proof, parent proof, etc. If you still can't provide an ID card, you can try to use other legal documents to sign the contract, such as a passport, driver's license, etc.