Editing text principle is very easy. The one thing to remember is that a layout program works most commonly in Layout mode (create and transform frame). To modify the text, the Content Edit mode needs to be activated. Do it by:
Double-clicking in the frame that needs to be edited
Activating the Edit Contents of Frame tool, the big "A" button in the toolbar
Once you're in Content Edit mode, you can change the text, add new content, or select words to apply formatting to them. Actually, if you look at the image of flowing text again, you might see that the spaces between some words are really too wide. Hyphenation could help get more constant spaces, which would make the text much more appealing and easier to read. That said, we have two options:
Hyphenate locally
Hyphenate the whole frame
The first is much faster, but hyphenation is not always a good thing because there is sometimes too much to be done. Trying with local hyphenations can be a good...