how to insert RSS info correctly

For some reason RSS is more complicated to me then it probably should be.

I cannot find out how to create a simple subscribe button without using a plug in.

There is a place on my site for putting RSS info but I am not sure what to put there.

Articles I read are all different or very vague on the exact solution.

Is it

or is it

or something else?

Now, I am being told to put something like

Which is even more confusing.

What should I put under:





Thank you for your time! Greatly appreciated!