The fix needs to be in

$UseCookies: If this variable is set to "0" (or commented out) the use
of "cookies" will not be implemented. If it is set to "1" it will be.
"Cookies" allow the board to recognize return visitors, keep track of
messages posted since their previous visit, maintain their personal
index display preferences, and automatically insert their names and
e-mail addresses into the post forms.

Optionally, this too:

$IsolateCookies: By default, if you have multiple forums, they will
utilize "shared" cookies, so that once a visitor has entered his
name and e-mail address on one, he won't have to enter them again
on another. If you prefer that your forums not share the information,
just set this variable to 1.

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