Update 21. Find the QR Code of BOT for opt-in contacts..md

added more description on QR code

docs/6. FAQ/21. Find the QR Code of BOT for opt-in contacts..md

@@ -25,3 +25,14 @@
 5. Scoll down `Smart mechanisms to get active and opted in users` section to get the QR code
 
 <img width="974" alt="image" src="https://github.com/user-attachments/assets/843e5cbe-96e0-4285-8dc5-42c8eacd4256"/>
+
+PS :This method generates a QR code for a fixed keyword like "Hi" or "Welcome," which might not be the right one, and you won't be able to edit or change the keyword.
+
+## Creating multiple QR codes
+
+To able to make multiple QR codes according to the specific flow follow the below steps:
+
+1) Create the link of a specific flow. [Read Here](https://glific.github.io/docs/docs/FAQ/Send%20a%20link%20of%20a%20specific%20flow%20to%20new%20contacts%20to%20join%20the%20BOT/) to know more on how to create link.
+
+2) Go to [Bitly.com](https://bitly.com/) and then generate QR codes.
+