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

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:

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

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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.