Motorola MG7540 User Manual page 50

Now set the start and end times of when you want to allow the device to have
Internet access. Here is an example of entries to allow Internet access in an
after-school period from 5:00 pm to 10:00 pm. We have named the sample entry
AfterSch:
Make sure to check the Enable box, and click the Save button.
Click the Add button to configure a Whitelist entry for an allowed schedule for
another device, if you like.
When you have completed all Whitelists, remember to Enable Parental Control at
the top of the page, and click Save.