Adding Opt in box for Rss subscription and / or for a download using Aweber form

Hello,
I am using Atahualpa v 3.5.1 .I would like to add an opt in form using Aweber. Where would I put the Aweber code? Would that be in a text widget and not BFA Subscribe? Or would I place it somewhere else?

If I want my visitor to opt in for a particular item that they can access, where would that code go?

I'm planning to put this in the right column.

Thank you.
Valerie