How to undo permission mess up

Hello All,

I recently updated my blog https://www.menandmentors.org and was seeing an indication of permission rewritable. Two night ago, I followed the guidance,looked a tutorial on youtube and now change the .htaccess (i think that’s it) but i cant remember what it was I do. And I cant get to open any page from the blog. I can only operate from in the dashboard. Can someone guide me please.

P.S: I am not good with tech stuff so please use simple words. Thanks.