Three parts, and you only touch the first.
You prepare a packet. Your signer signs it. The record writes itself while both of those happen, which is the part that matters when somebody asks you to prove it a year later.
Preparing
Drop in a PDF, say who signs it and drag the fields onto the page. Each person gets their own colour, and every field carries a name you choose rather than one we generate.
Read about preparingSigning
Your signer follows a link and starts. No account, no password, no app, on a phone or a laptop. They come back for their copy the same way, months later.
Read about signingThe record
Everything that happens is written down as it happens and sealed so it cannot be quietly rewritten. Anyone with the code can check it themselves.
Read about the record