Posting only linking to archive

According to the Template Hierarchy WordPress first tries to use your theme’s single.php to display the single post view…did you lose that file?

No, that file is still there.

I link to see the problem, please.

https://rbd.risd.edu/index.php

What are using in your theme’s index.php to display the post title? Look at the WordPress Default theme’s index.php for an example if necessary.

Also make sure your permalink structure is correct (Administration > Settings > Permalinks )