You're not allowed to change these restrictions. It's either due to edit restrictions on the page, or permissions settings for this space.
Hi @Jingyi Shi ,
this means, that either
In both cases, ask your space administrator or Confluence administrator for help.
maybe it is easier to create an own space???
if you are not an admin, you can't create a space. Please talk to your local administrator. He should be able to help you and find out, why you can't set a restriction to the page.
OK. Thanks! How can I find out, who are the local admins?
https://<your-confluence-url>/contactadministrators.action
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