Bloggers often want to know how to allow people to post on their blog. The answer, unfortunately, varies depending on the blog platform used.
Some platforms, like WordPress, allow users to create specific posts called “blogs” and then set up permissions for who can access them. Other platforms, like Blogger and Medium, allow users to create public or private blogs and then set up permissions for who can access them.
In general, however, most blog platforms have some way of allowing users to create posts and set permissions for who can view them. The best way to find out is to consult the help documentation for your particular blog platform.