How to enable HTML

Hello,

I updated my cutenews today, I had a very old version since 2008 and I upgraded for the first time, the upgrade was a success but I am trying to figure out how to enable my html for my older post.

Most of my old post are done with html and I was able to fix a few of them but I have to do them one by one, I will like to know if theirs a way I can do them all at once without having to do them one by one cause I have over 5,000 post.

Thank you!