Adding Text: You can only add text on the cover of your calendar. When editing it, you will see a text box where you can add text, select the font and size you want.
Editing Text: On the edit page, a T button will appear under the calendar page if some text can be edited. Click on it and an edit box will appear where you can change your text.
Deleting Text: You can delete editable text in a calendar by simply erasing it. If the text is editable, a T button will appear under the calendar page in the editor. Click on it and delete your text. Remember to click on Save.