Here are some links to help you:
On a browser:
https://help.dudesolutions.com/Content/FAQ/Creating%20a%20Bookmark%20or%20Desktop%20Shortcut.htm
On an iPad / iPhone:
https://www.support.com/how-to/how-to-add-a-bookmark-on-iphone-ipad-or-ipod-touch-12470
On an Android:
https://www.support.com/how-to/how-to-add-a-bookmark-to-an-android-phone-or-tablet-12468