Before me means that the act was conducted in the presence of the notary. Credible witness is a third person who personally knows the document signer, and verifies the signer's identity. Execute means making or completing a signature. Jurat is the notary's certificate on an affidavit. Personal knowledge means having an acquaintance, derived from association with the individual, which establishes the individual's identity with at least a reasonable certainty.
Satisfactory evidence is valid I.D. card or papers, or use of a credible witness.