iCloud Keychain is a great way to save all the passwords for the web services we use every day, and if you use more than one Apple device, even more.
Although this feature works really well, sometimes the system "forgets" to suggest if we want to save a password on a particular website. If you use that site often and would like to have your password saved on all your Apple devices, you'll need to Enter the password in iCloud Keychain manually.
Enter iCloud Keychain passwords by hand It is very simple, and you can do it from your iPhone, follow these simple steps to do it.
Step 1- Sign in Settings
Step 2- Scroll down a bit and enter the Safari options.
Step 3- Look for the option Passwords and enter it.
Step 4- Now you will be seeing all the passwords that you have saved in the iCloud keychain, scroll to the bottom, the last option is add password, tap on it.
Step 5- Now you only have to fill in the information that is requested and click on the OK button.
And that's it, from now on your iPhone, or any other Apple device that you have added to iCloud Keychain, will remember the password and username for that website and you will be able to access it easily