I am trying for two days to resolve the images not appearing issue on Github pages. I searched and applied all the ways. Please guide me step by step and if possible with a screenshot. the answer with ../ is not working. I am confused about where to put it. should I edit the indes.html file inside the repository file or just edit in the local file on the desktop and then upload it. my spelling and case are also correct.

here is the link to the repository

Perhaps I misunderstand your question, but is it as simple as the path to your image is wrong? Within your repository the qr png image and your webpage reside in the same folder. So changing line 32 of index.html to src="image-qr-code.png" makes it display.