How Do You Modify Vertical Blocks of Text on a WordPress Web Page?

Problem scenario
There are vertical blocks of text that are common to every posting of your WordPress site. (Or you want to add advertisement banners to your website.) How do you modify the text in those?

Solution

1. Log into the WordPress web UI
2. Go to "Dashboard"
3. Click on "Manage widgets" or "Appearance" (either will work)
4. To the left of "Available Widgets", expand "Footer" or other options on the right-hand side. You should be able to find the first words of the block of text that you want to change.