You can read every guide, use the tools, and start a text chat with a name. The open conversation is not indexed for search. City pages exist so a text chat can stay inside one city.
Claiming an account continues that chat in the app and can add a bonus in tokens.
What to do on a shared browser
Do not stay signed in on a lab computer. Sign out, and sign that device out from a computer you trust if you forgot.
Downloads land in the computer's download folder. Prefer the vault, which stays in the account, when the computer is not yours.