How do I turn Accessibility Mode On or Off on my Ebook Central account?

If you are using a screen reader, the option to turn accessibility mode on or off will be read out by your screen reader. See Ebook Central: Accessibility Mode for Screen Readers

If you cannot turn it on using a screen reader, after you have signed into your Ebook Central bookshelf account online, bring up the Profile page by clicking on the Settings -> Profile menu items located on the top right corner of the page:

User-added image

Scroll further down the Profile page to click on the options whether to enable the Accessibility Mode (or disable):

User-added image

When finished be sure to:
1. Check the privacy and terms of service box
2. And hit the Save Changes button to complete the process.