Below the article post there is a link "View all articles from feed" but I agree, that needs to be more visible to the user.

Yes, you are right, there is no way to advance to the next article without going back to the article list. 
I was thinking about opening article pages in a popup instead of redirecting to the separate page.

What do you think, what would be better, popup or previous/next buttons?

Hi Chad,

I have exactly the same configuration and it is working fine on my end. I just published some changes so there might have been some delay in loading css/js and that's why the popup was a bit off.
Could you please try again and upload a screenshot so I can see it?

It makes sense, and I already planned that. There will be a separate page where you will be able to see all the tags - stats (users subscribed, articles, top articles etc) and you will be able to search for it and subscribe directly. 

Hi Denny, you can now filter articles by time.
When you click on "Edit" next to "Your tags", you will be prompted to select the filtering options. You can choose to hide articles older than 2 months / 3 months / 6 months / 1 year or older than a specific date.

Let me know if this meets your expectations and if I can make it better in any way. Looking forward for your feedback.