Follow these steps to modify a plugin code using the Plugin Editor and add some content before the post content:
- Log in to the WordPress Dashboard as an administrator.
- Click the Plugins menu.
- Click the Plugin Editor sub-menu item.
- Click the I understand button to get the following screen:
- Open the Plugins menu in a separate browser tab.
- Click the Deactivate link of the plugin you want to edit and switch to the previous tab with the Plugin Editor. In this case, we will be using the built-in Akismet Anti-Spam plugin.
- Choose the plugin you want to edit from the Select plugin to edit: field.
- Click the Select button to load ...