Installed theme and now have zero access to dashboard

I installed this theme to wordpress

I tried to preview it. Wouldn’t work. I activated it, just wanting to see what it looked like. And now I have zero access to the dashboard. I’m still logged in and I can click on it or anything else, like themes, and it just takes me to a blank white page.

My website is yeseniavargas.com. Any and all helps is extremely appreciated. I’ve tried restarting browser and computer, trying a new browser, trying another device, clearing the cache and no luck. Thanks.