Click on the Menu icon of the browser, it opens up a list of options. Click on the Options , it opens up the settings page, Here click on the Privacy Security options listed on the left hand side of the page. Scroll down the page to the Permission section . Here click on the Settings tab of the Notification option. A pop up will open with all listed sites, select the option ALLOW, for the respective site under the status head to allow the notification. Once the changes is done, click on the Save Changes option to save the changes.