By hand
In the admin
- Open the post in the editor and press Post settings.
- Under Who can read, choose Public, Members only, Paid members only or Specific tiers.
- For Specific tiers, tick the tiers whose members read the whole post.
- A draft saves by itself; on a published post, press Update. The paywall is live at once, on the site and in every theme.
- To lock many posts, tick them on the posts list, open Access, choose who can read and press Apply.