index moving

a long time ago I found an artikel about how to change the adress of the wordpressblog. For example: normally its: https://www.yoursite/wordpress/…
but I want to change to https://www.yoursite/index.php. So I want to move the index file. What I have to pay attention? It doesn`t work right now.

I know there are already answers to that question, but I cant find it again. Who can help me?