Legal analysis: I have to sign it. When entrusting others to exercise their legitimate rights and interests on their behalf, the client shall show the legal documents of the client when exercising his power. The trustor shall not abandon the entrusted matters for any reason. The power of attorney shall specify the agent's name, agency matters, authority and time limit, and shall be signed or sealed by the principal.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 919 An entrustment contract is a contract in which the principal and the agent agree that the agent shall handle the principal's affairs.

Article 922 The trustor shall handle the entrusted affairs according to the instructions of the trustor. If it is necessary to change the client's instructions, it shall be approved by the client; If it is difficult to get in touch with the client due to an emergency, the agent shall properly handle the entrusted affairs, but shall report the situation to the client in time afterwards.