Hello. I have tried creating a custom blog post page for my blog. I copy-pasted the codes as shown in the article https://www.wix.com/corvid/example/custom-post-page However, everytime I load an article, the header image and the title appears the same everytime. Can someone help me. I do not know any coding

This is the original image, title, and description I want to update but I can't find the source file and text from the Blog and post settings. I checked the blog feed and can't find it. I can only enable / disable the ability to view, but I can't change the image nor update the content.

I wanted to add ads.text file to my website from pubconsole media.net. Please guide me to add the ads.text file.