Cannot Login-Reroutes URL

Hi. I am new to www.remarpro.com and am finding my way through new terminology, so please be kind and bear with me, thank you! I just installed WordPress today (I had no problem installing it), but now I cannot login. Unfortunately this means I can’t tell you exactly what I did wrong, because I can’t access my account to retrace my steps.
This is what I recall:
My site URL is set to: https://www.marenmisner.com/wordpress/
I wanted to change this to https://www.marenmisner.com/blog/
So I changed one of the settings in my account to redirect the blog (or so I thought I was doing). After I did this, my login in screen from: https://www.marenmisner.com/wordpress/wp-login.php redirects to https://www.marenmisner.com/blog/wp-login.php and I get the “Error 404-Not Found” message.
I have scoured the forums and exhausted google searches trying to fix this, and I would greatly appreciate any help you can give. Please let me know what information you need to further address my problem. Thank you!