The WordPress default text editor does not offer complete options for controlling text and images within pages and posts. You will need to install a wordpress plugin called TinyMCE Advanced for you to have buttons such as font size, spell checker, undo, redo, etc.
To install the TinyMCE Advanced plugin:
3. On the Install Plugins screen, under the Search tab, enter tinymce advanced into the Search field, and click Search Plugins.
4. On the Search Results page, look for TinyMCE Advanced and then click Install Now just below it. Click OK on the message box that comes up.5. After the plugin has been successfully installed, activate it by clicking Activate Plugin.
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