Settings → Members & roles lists everyone in the organisation and the role each one holds.
The Members & roles tab in Settings, listing member emails with a role selector for each

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The roles

Roles are cumulative — each includes everything below it.
Read-only. Sees RFCs, statements, the dashboard, coverage and the audit trail. Cannot create or change anything.The right role for most engineers: they need to read the standards, and their agents and CI pipelines read them via API keys rather than user accounts.
Everything a viewer can do, plus create RFCs, save revisions, duplicate documents, and propose an RFC for review.Cannot approve — including their own RFCs.
Everything an author can do, plus submit reviews and approve RFCs where they belong to the assigned reviewer or approver group.Cannot promote to enforced — that is a domain owner action.
Full authority. Approves anything in their domain regardless of group assignment, promotes to enforced, deprecates and archives, assigns reviewer and approver groups, and manages every Settings tab.

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Changing a role

Domain owners change a member’s role from the selector on their row. The change takes effect immediately and is recorded in the audit trail.
Do not leave your organisation with a single domain_owner. If that account loses access, nobody can approve an RFC, promote a standard, or issue an API key.

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Adding members

New members join by signing up against your organisation and being assigned a role here.

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Roles versus groups

These are two different mechanisms and both matter: A member needs the approver role to approve anything at all, and membership of the RFC’s assigned approver group to approve that RFC. Domain owners bypass the second requirement within their own domain. See Groups.

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Suggested shape

Small organisation

Two or three domain_owners (never one), a handful of authors, everyone else viewer. Skip groups until the volume justifies them.

Larger organisation

One domain_owner per architecture domain, approver for staff engineers, author for anyone contributing standards, viewer by default. Use groups to route review.