Dashboard won’t open – Error 404

Hi,
I recently changed the domain name (https://www.dharmabakery.com/blog/) and had some problems with broken entry links. I fixed those from the Permalink settings, but now I can’t access the dashboard. After logging in, it goes to an “Error 404 – Not Found” page where the blog entries should be, but everything else like the header image and sidebar still show up.

How do I fix this? Thanks.