dangerous plug in highjack my site

Don’t install this plugin “B Slider”, it’s dangerous for your website, once installed it doesn’t even work, gives error on the website, and then won’t even edit the page. And the more cruel thing is that it is not even disabled, neither by the admin nor by the developer. This is a dangerous situation. In which my website is stuck. It seems that this plugin has hijacked my website and made it a slave, now the plugin is neither un-installing nor giving an edit option. Nor is fixing my site. I’m stuck. . My site is down, my efforts are in vain