To apply styles to your images/buttons or text, select the content and go to "Styles" drop down. Choose one of the following available styles (you may not have all custom styles listed here): ...

Click "style.css" from the list of files ... Use the same procedure to add the text box to "archive.php" for the category pages, "page.php" for WordPress pages or "index.php" for the main template.

Click the Text Box button in the toolbar. Select one of the premade text box styles from the list to add it to the document at the cursor's current position. Alternatively, click Draw Text Box to ...