- Login to your WordPress account in which you are using Block Editor.
- Get inside Plugins section from the left panel list and then click over Add New.
- On the next page, search for Classic Editor plugin.
- Select the Classic Editor Plugin and click over Install Now.
- As you install the plugin, click over Activate.
Now, you can easily edit or add any posts by using the Classic Editor in your WordPress website.
To go through in detail procedure, check out the blog.