Install the Plugin:
Find and install the QR Code Generator plugin from the Bubble Plugin Marketplace.
Add the Element:

Drag the QR Code Generator element onto your desired page.
Set Up the URL Input:

In the property editor, enter the URL you want to convert into a QR code.
Create a Workflow:

Set up a workflow to trigger the QR code generation (e.g., on a button click).
Display the QR Code:

Add an Image Element to your page and set its source to the generated QR code URL.