Three ways to answer
Choose Logged-in users only when you need a verified name and email with every response. Choose Anonymous users only when no pupil identity should be saved. Choose Anonymous and logged-in users when pupils may decide whether to identify themselves.
Anonymous pupils are given a private, temporary identity behind the scenes. This lets School Words enforce one response per pupil without saving a name or email address.
Two different lists
There are two layers, and they do different jobs.
The registry decides who may use School Words at all. It is managed centrally by an administrator and is the same for every activity — see Signing in.
The Access tool is per activity. It narrows things further: with it you can say that only these twelve addresses, or only this domain, may answer this question.
Setting it up
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Choose Logged-in users only
Domain and address restrictions apply to verified accounts, so they are available in this mode.
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Add domains, addresses, or both
A domain admits everybody at it. An address admits one person.
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Save these rules
Nothing takes effect until you do.
Where it is enforced
These rules are applied on the server as well as in the app. A pupil who is not on the list cannot send an answer even if they somehow reach the page — the refusal does not depend on their browser behaving.
Important
Restricting access does not hide the question. Somebody with the link can still see what was asked; they simply cannot answer it.