Legal analysis: if authorized by the parties, the name of the friend should be signed, and the name of the signer should be indicated. The client signs his name on the entrustment contract, for example, Zhang San entrusts Li Si to attend the meeting, Zhang San is the principal and Li Si is the principal, and the power of attorney needs Zhang San's signature. A principal refers to a person who entrusts others to handle affairs for himself. In the securities brokerage business, the principal refers to a natural person or legal person who can buy and sell securities according to the provisions of national laws and regulations. Refers to the citizens, legal persons or other organizations that entrust the company to auction the auction items or property rights that they enjoy ownership or disposal rights.

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

Article 162 A civil juristic act carried out by an agent in the name of the principal within the scope of his agency authority is effective for the principal.

Article 163 Agency includes entrusted agency and legal agency.

An entrusted agent shall exercise the power of agency as entrusted by the principal. A legal agent shall exercise his power of agency in accordance with the provisions of the law.

Article 164 An agent who fails to perform or fails to fully perform his duties, thus causing damage to the principal, shall bear civil liability.

If the agent and the counterpart collude maliciously and damage the legitimate rights and interests of the principal, the agent and the counterpart shall bear joint liability.