By default, Apple allows you to log into websites and apps using credentials saved in iCloud Keychain through a feature called autofill (password autofill). In case you want to use a dedicated third-party password manager instead of iCloud Keychain, you still set up that third-party tool as the default password autofill service on your iPhone and iPad. .
Apple allows you to use up to two password autofill services at the same time on your iPhone or iPad. You can use iCloud Keychain and other services like Bitwarden or LastPass. You can also turn off iCloud Keychain and set a third-party service as the default.
The default password autofill service change process is basically nothing complicated and different between third-party password management tools. However, we recommend that you fully enable Face ID or Touch ID (if applicable) on the third-party password manager app you plan to use. This ensures that you will not need to enter your master password every time you want to log in to the site using that third-party password manager.
Once the password manager setup is complete, navigate to the application “Settings”(Settings) on iPhone or iPad.
In the menu that appears, find and click the “Passwords” (Password).
Authenticate yourself using Face ID, Touch ID, or a pattern lock passcode, then choose the “AutoFill Passwords”(Password autofill).
Next, choose the third-party service you want to use. You can also click on the option “iCloud Keychain“To turn it off.
The service you choose will need to be verified. In the example in the article, Bitwarden will ask you to log into your account with your primary password (or authenticate with Face ID or Touch ID). Press the button “Submit”(Send) for verification.
After the authentication is complete, click on the button “Back” (Come back).
You can now continue using your iPhone or iPad as you normally would. The next time you visit or log in to a website, you will see a suggestion from the password manager of your choice.
Just choose a password and authenticate yourself (using your master password or Face ID), your username and password will be filled in automatically.
Source link: How to use autofill with third-party password managers on iPhone or iPad