changed …/Blog to /blog now all my support pages won’t work!

i was looking around my website and one of the contributors wanted to change the …/Blog to …/blog. they did that and it resulted in none of the wp_login.php to work.

i wanted ahead and changed a couple of things in the function.php, instructions here https://codex.www.ads-software.com/Changing_The_Site_URL

and i was able to get back into my dashboard and change the …/blog into …/Blog.

i am not able to see the initial page but i am unable to load up any of my other supporting pages like …/Blog/about, etc….

please help!!!!