Go to the adminCP, and under Plugins & Products (on the left) click on Add New Plugin. Select the hook location from the drop-down menu and paste the code in the large text area. Enter a title (something so that months or years from now you'll remember what this is for), then click the "Yes" radio button to enable the plugin, and Save. You can leave the other fields at their default values.
If it causes a problem and you want to disable or delete it, you can use the Plugin Manager.
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