Here's how to add a website shortcuts on your iPhone/iPad Homescreen:

• Open your Internet browser (Safari)
• Type in the web address (go to the website)
  
• After the website loads, tap on the share icon at the bottom (this will be a box with a up arrow in it, where you go to save a photo or add a favorite)
  
• In the share sheet, tap on Add to Home Screen
• Give the website a name in the first text field (it's up there by default but if you want to change it, do it here)
• Tap on Add from top-right.