Get a document officially notarized so its signature is legally verified.
Leave the signature line blank. A notary must witness you sign in person, so signing early can void the notarization.
Banks (often free for customers), UPS Stores, libraries, shipping stores, and law offices have notaries. For remote options, search "online notary" services that operate by video.
Bring an unexpired government photo ID such as a driver's license or passport. The name on the ID must match the name on the document.
The notary will confirm your identity, watch you sign, then add their stamp, signature, and the date. Pay the fee (often a few dollars per signature; some states cap it).