Safari is limited by parental controls.

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To add this website to your bookmarks bar, click the Add Website button below. You need an administrator password to add this website to the bookmarks bar. When it’s added, the website will open.

If you want to add several websites, you can turn off the parental controls. Open Safari preferences and click Security, then deselect “Enable parental controls.” When you're finished, be sure to turn on parental controls again.