> ## Documentation Index > Fetch the complete documentation index at: https://bigbluebutton.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # In Application Authorization > Administrators can let users create their own Personal Rooms accounts, and choose whether sign-up is open, invitation-only, or requires approval. In Application Authorization lets anyone with your Personal Rooms URL create an account, regardless of their email domain. Use it when your users are not all on a single Google or Office 365 domain. You control who can complete sign-up by choosing one of three [registration methods](#registration-methods). ## Registration methods Choose one method. The methods cannot be combined, and the method you choose applies to everyone who tries to register. * **Open registration** — anyone with your Personal Rooms URL can sign up and sign in. * **Join by invitation** — open sign-up is disabled. Only people who receive an email invitation from an administrator can sign up. * **Approve/decline** — anyone can sign up, but an administrator must approve the account before the user can sign in. ## What we need from you The registration method you want to use. Send your choice to [support@blindsidenetworks.com](mailto:support@blindsidenetworks.com), along with the name and email address of the person to set up as your Personal Rooms administrator. You can change the registration method at any time from [Site Settings](/docs/help/personal-rooms/admin/site-settings) in the Administrator Panel.