Double click a blank bit of page for the quick menu and select the centre button to create a text box.
Text boxes can be moved, resized, grouped and ungrouped in exactly the same way as images.
Normal text
Preset styles have a number of advantages over selecting font and size manually and should be your first choice.
quicker to use
updates automatically with change of theme
reliably clean design
headings create bookmarks on the page that can be linked to (see page on links)
Allows you to pick any font, text size and text color which can be very effective - if not overused!
Explore the text sub-menu to find options such as code font.