To customize any text in your story, you can use the text editor.
To open the text editor, simply highlight a portion of text.
You will see the editor appear in a black bar above the highlighted text. Like other familiar text formatting tools, you can:
Make the text bold
Make the text italicized
Make the text underlined
Add a link to the text
Make the text a quote
Simply click on the desired option in the black bar and your highlighted text will automatically change.
To go back to the original formatting, select the undo button on the top left, or re-select the same option to reset.