Cant access wp-admin

I wanted to redirect my landing page to my HOME page url and changed it in general settings. I can no longer access my site via wp-admin or through any page as they are no longer visible.

I have an Artisteer theme with banner headings etc and the landing page does not.

How do I access wp-admin via cpanel as this is the only thing I can access.

https://www.freedomtobe.com.au

I changed it to https://www.freedomtobe.com.au/freedom-to-be and that caused the issue.