Subdomain and Permalinks Wackiness

I’m a relative newbie to WordPress and coding for the internet in general, so please excuse any stupidity right away.

I set up the Network for my personal homepage last night as I wanted to have the travel photo blog be my main page as well as have a second blog for personal musings. Naturally, everything seemed to go ok, but it doesn’t work.

First issue: All the permalinks were changed on my photo blog. I had them set for category and post name (for SEO purposes) and now they are all blog/year/month/date and post name. Can that be changed back or will it screw things up? And if it can be done, are there any special steps I need to take?

Second issue: I created the subdomain via my webhost. It placed the subdomain folder within the root level of my FTP. The second site shows in the SuperAdmin panel and seems to be setup, but I can’t visit the site to create new posts. There is nothing in the subdomain folder except what was placed there by the webhost when it created the subdomain.

My main site is https://www.chaseclark.com and the secondary blog is at https://www.blog.chaseclark.com.

Obviously, I’ve missed something important, but have no idea what it is. If anyone has any clue how to rectify either situation, I’d appreciate the help. Thanks.