The Recipe Clipper (Bookmark) can be installed on the desktop version of Safari by first showing your Favorites Bar, then dragging the Add to PTE box below into the Favorites Bar.
If you are using iCloud to synchronize your iOS devices with your Mac computer, you can also choose to synchronize Safari, which will include the Recipe Clipper Bookmark and make it accessible on all of your iOS devices.
To do this on your Mac: Open your System Preferences, then iCloud, and make sure that Safari is set to sync.
On your iPhone or iPad: Open the Settings, then iCloud, and make sure that you are signed into this device with the same Apple ID as your Mac. If Safari is not already in the on position, toggle it on.
With this enabled, your desktop's Safari bookmark will automatically synchronize with your iOS device. You will be able to add recipes to your Plan to Eat account from your iOS device in the same way that you can on the desktop.