To create a page which only has text, you will want to start with a blank page.
If you have a page which already contains images, you'll first want to select them, click the "Empty" icon (trash bin icon), and then click the "Delete" button to remove the image placeholder.
Once you have removed the contents on the page, open the "Text" toolbar and add a text field. Make sure the page is selected when you do so.
A text field can be as short or long as you like. The text region will grow with the amount of text you add. You can resize the text field to achieve your desired placement on the page.
Add as many text boxes, fonts, and colors as you want!
For more information about working with text, check out these additional articles: