The probate court correctly held that the decedent’s emails and electronic answers to a questionnaire did not validly amend her revocable trust before her death. The decedent did not sign the electronic writings. And the Uniform Electronics Transactions Act (Civ. Code 1633.2 et seq.) did not apply to treat her electronic writings as “signed.” The UETA applies only to transactions between two or more individuals, not one-party transactions such as a will or trust. The mere fact that the trustor had to deliver her unilateral amendment of the trust to the trustee did not make the transaction a two-party transaction to which the UETA would apply. Furthermore, to amend the trust, the trustor would have to intend the writing (here, the emails and questionnaire answers) to themselves amend the trust, not merely indicate how the trustor intended to amend the trust in some other document. Here, the writings clearly showed they were written in anticipation of a formal amendment to the trust and were not intended themselves to constitute an amendment.