blank white screen trying to access wp-admin page

Hi all. I am very new to this and I am trying to create a fun place for me and my friends to hang out:
https://www.griffintoby.com/blog/

I installed the WP Auctions plug in just to check it out and now when I try to access my admin page I am just getting a blank white page. I can’t uninstall because I can’t get to the page!

Any advice?

Thanks!