Noise.Cash is an abbreviated option of article writing sites with free money on offer as BCH. 

Tipping is free and is based on its own algorithm with funds provided by their admins and sponsors. So you don't have to spend a single cent to give tips and receive tips. 

So why would you want the option of QR code tipping on the site?

1. There are competitions occasionally. Presently there is/was one where you give any QR tip (as low as 1 cent) and you receive 1$ added to your account as a prize. 

2. You can control the amount you give as a QR tip and hence shoe your appreciation to people who write well. 

The procedure is simple and I've attached screenshots. The screenshots are from an Android mobile phone. 

1. Open the post by the author that you would like to tip.

2. Tap on the $ sign which shows how much they have earned in tips (this may even be $ 0.00). It is to the left of the heart you usually tap on to give random tips. A submenu will open which will show the tips received and the QR option. 

3. See this

"Tip this post using:

QR code"

Click on where it says "QR Code". 

4. A sub menu will pop up showing the QR code and the bitcoin cash address to send to. 

5. Click on the QR code image. This will open your BCH wallet "Send" page with the details of the recepient already filled in. 

6. Choose how much you want to send. 

7. "Send"! Now you can close your BCH wallet. 

In a few seconds the browser with the Noise.Cash page opened will show you a confirmation. 

All done!

Noise Cash does not have a referral page, but you can visit my profile page and join up or just look at the stuff I post. 

https://noise.cash/u/sleepyjey

If you have any queries, post them here and I'll clarify your doubts.