Someone be a hero and help a newbie

The Codex is you best friend and… hero ??
https://codex.www.ads-software.com/Plugins/Syndication
Use one of those plugins.

I have installed Aggrss and don’t know what code to put where ??

Does Aggrss come with any instructions?

yes it does and tells everything accept where to put the damn code.. I have tried to put it in sidebar and header locations

I think Agrss is just crap

I use CG-Feedread and you can do with it pretty much what you want:

https://www.billhayes.us/wordpress/subscriptions/
https://www.billhayes.us/news.php
or Recent Posts in:
https://www.billhayes.us/

Edit: Let’s keep it civil. I am sure you wouldn’t like someone posting that your blog was pure drivel. Someone spent their time and energy to write the code and was kind enough to make it available to others, free of charge. Use it, don’t use it but keep the negative criticism to yourself.