I need to lock my iPhone XR. It’s been stolen.

Your phone is already “locked” by it’s secure passcode.

You need to place it in “Lost Mode” using FindMy and add an on-screen message to aid it’s recovery.

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Please follow the steps in this Apple Support document carefully.

If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support

Click here for information; all of the options are available through Find My or by asking your wireless carrier to blacklist it.

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momma163 Said:

"I need to lock my iPhone XR. It’s been stolen.: My iPhone XR has been stolen and I need to lock it."

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Secure your Accounts:

When it comes to Accounts, you should modify the credentials every-so-often, for security purposes.

A. Verify Your Devices:

Verify that your the devices logged in to your account or officially yours, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

B. Consider Modifying your Credentials:

Having been stollen, someone likey has your credentials. So, by all means, consider modifying them, starting with a new password.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

C. Lock Using Find My:

Note that Find My, can only be enabled directly on the iPhone. It cannot be enabled elsewhere. So, if it is not enabled, then performing this on "Find My" is not an option. Note that it will show up in the latest location is was seen, when connected to  WiFi or a Cellular network.