Plugin: My site has been redirected my site

I previewed a plugin, and installed it now my site has been redirected. I’ve reached out to my domain host, but now I wanted to see if there was something I could do via some help here on the forums.

I keep getting this error message when I type in the site in my browser bar.

“Fatal error: Call to undefined function is_admin_bar_showing() in /home/ns19a/public_html/orangepcm.com/wp-content/plugins/genesis-admin-bar-plus/genesis-admin-bar-plus.php on line 531”

I’m not sure what to do with this, because there is no way to get into my dashboard to unistall the plugin.

Help please…