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Click "Plugins" from the left side menu.
Click "Add New".
Type "TinyMCE Advanced" in the Keyword input section.
"TinyMCE Advanced" install button will appear.
Click "Install".
Click "Activate Plugin".
Click "Setups".
Drag and Drop one of the icons to the top section.(The example is for the "Font size". The icon is already on the top section depending on the version of the plugin. )
Click "Save Changes".
When you write contents on the "Edit Page", you can use the "Font Size".
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