How to create and change the destination URL of a dynamic QR Code

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Click on Create QR Code from the QR Code or Dashboard section. Then select URL and choose the dynamic option. Enter the target URL. As an option you can set a custom shortened URL. This will be the name that is encoded in the QR Code. Finally click the button Create QR Code.
Dynamic QR Code creation dialog
Once you have created a dynamic QR Code you will see the code in your account. On the left side, the custom shortened URL is shown that redirects to the target URL which is displayed on the right. Optionally you can click on the QR Code and set a custom Designer QR Code.
Short URL and destination URL of a QR Code

If you have printed the QR Code from above and you decide in a later step to change the target URL simply hover the target URL on the right. You will see that a pencil will occur.
Destination URL update option
Click on the target URL to edit the URL. After you set the new URL simply hit enter or click on the save icon.
Save the new target URL
If you scan the same QR Code after changing the target URL he will now redirect to the new page. Optionally you can also change the title of the QR Code the same way you changed the target URL by clicking on the title.
Dynamic QR Code with new target URL