Here are the step-by-step instructions for adding the Wicked Tennis website to your homescreen with saved credentials on iPhone and Android devices:

iPhone (iOS):

1. Open the Safari browser on your iPhone.
2. Navigate to the Wicked Tennis website (example: www.wickedtennis.com).
3. Log in with your credentials. Safari should prompt you to save the login details. If not, go to Settings > Passwords > Autofill Passwords, and make sure it's enabled.
4. Once you're logged in, tap the Share button at the bottom of the screen (it looks like a square with an arrow pointing upward).
5. In the Share menu, scroll down and tap "Add to Home Screen."
6. Edit the name of the shortcut if you'd like (for example, "Wicked Tennis"), then tap "Add" in the upper-right corner.
7. The Wicked Tennis website shortcut will be added to your home screen. When you tap the icon, it will open the website in Safari with your saved credentials.

Android:

1. Open the Google Chrome browser on your Android device.
2. Navigate to the Wicked Tennis website (example: www.wickedtennis.com).
3. Log in with your credentials. Chrome should prompt you to save the login details. If not, go to Chrome settings > Passwords > Save passwords, and make sure it's enabled.
4. Once you're logged in, tap the three-dot menu in the upper-right corner of the screen.
5. In the menu, tap "Add to Home screen" or "Install App" (if the website has a Progressive Web App version).
6. Edit the name of the shortcut if you'd like (for example, "Wicked Tennis"), then tap "Add" or "Install."
7. The Wicked Tennis website shortcut will be added to your home screen. When you tap the icon, it will open the website in Chrome with your saved credentials.