domain mapping wrong direction

i created a domain mapping but must have done it backwards. instead of my personal site (bitsykemper.com) bouncing to my wordpess blog (bitsykemper.wordpress.com), now when i type in my wordpress URL, it goes to my personal site. i can’t get into my wordpress account to change it b/c i can’t to my wordpress site without being redirected to my personal site! and even if i COULD get in, i need help on making the change correctly. help!

https://ww.wp.xz.cn/plugins/wordpress-mu-domain-mapping/