We have a whole bunch of different text items for you to use. Every time you see text in a document it comes packaged in a format which you can edit virtually any way you like.

Find them by clicking Text on the toolbar to the left of the document.

Just click one to add it to your document.

The choice includes simple text boxes under Basic, such as Normal text or Heading styles (click All > to see the full list). Click to add them to your document and then simply start typing.

There are also more advanced text items under Fancy Text such as text panels, speech bubbles, stickers and various other useful designs.

Again just click to add to a document.

These text elements come with a set of control handles, here's a speech bubble for example...

You'll notice that as you hover over the handles (the blobs) you'll see a tip describing its function. The blue outline indicates that the whole panel is selected and available to be moved. 

Text editing - that is the editing of the text itself, which includes Text selection, Text styles, Font selection and the Spell checker, is covered in the Text section.