D-Link DSL-2740B Configuration Manual page 4

5. Enter the URL of the website you wish to block access too e.g.
Select Schedule if you wish to set the filter to 'always' block the site or select a pre-configured schedule.
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Select Manual Schedule to create a new schedule in which the site will be blocked.
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6. Once all information is set, click on APPLY to save the changes and verify whether the sites are being blocked.
Support – How to configure Web Filtering.
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