frames and target=_self

I’ve read the posts about target=”_blank”. this is not what I want to do.
I have a framed environment, the body frame is the one generated by wordpress. when I click a (more…) link, I want that link to open up in the same frame.
I’ve tried editing the template-functions-post.php to include ‘target=”_self”‘ but it still opens in the full browser.
is there something in wordpress that is changing this behavior somehow, or is it the HTML i was given?
the site i’m working on is here – i DID NOT design this site. i’m just implementing a blogging system into the cruft I was given.
https://alisonmae.com/wmbd/
thanks in advance for all help. it is greatly appreciated.