Delete redundant WordPress roles

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Today I wanted to integrate a forum into my blog, and used the bbpress plug-in, but later gave up. After all, it was just a blog. If I really wanted to make a forum, the functions of bbpress were too simple, so I deleted it, but left many useless roles in the user options. So I searched Baidu for methods, but couldn't find them. Later I triedUser Role Editor, the problem is solved.

It should be noted that the role category to be deleted requires that there are no users under this role. If there are any, please transfer them to the commonly used role category first. Needless to say, compared to a novice like me, I can handle it, so you should have no problem. If you don't understand, leave a message..