Invite members
Studio, then Settings, then the Members tab.
Inviting
Enter an email, pick a role, send. They get a link that signs them up (or signs them in, if they already have a Postlyra account) and joins them to the brand.
The link is the credential, and it is single use. Anyone holding it can accept, so treat it like a password.
You can resend an invitation, or cancel one that has not been accepted.
Removing
Removing a member revokes their access to that brand immediately. It does not delete their Postlyra account, and it does not touch their access to other brands on the account.
Owner only
Only a brand owner can manage members
Inviting, resending, cancelling and removing are all restricted to the owner. The Members tab renders read-only for everyone else.
Seats
How many members a brand can hold comes from the staff_accounts allowance on your plan. The Members tab shows used against the limit.
Hitting the limit gives you "You have reached your plan limit. Upgrade for more." Remove someone, or upgrade. See Plans and billing.
Roles
Assigned when you invite, changeable afterwards. See Roles and permissions for what each area covers.
The short version: content.manage lets someone approve and schedule, which means publish to your connected accounts. Give it deliberately.
Members across brands
A person is invited per brand. Someone on two of your brands can hold different roles in each, and switches between them with the brand switcher exactly as you do.
Adding someone directly
The API has POST /users, which creates a member with a password you set. It exists for provisioning scripts.
For actual people, invite them. They pick their own password, and you never handle it.