Simply visit the 插件 » 安装的插件 page and check the box next to the plugins you want to deactivate. If you want to deactivate all WordPress plugins, then simply check the box at the top to select all plugins.
PhpMyAdmin will now load your database tables in the right panel. You need to click on the ‘Browse’ button next to the wp_options table (your WordPress table name may differ depending on your WordPress 数据库表前缀).
To delete them, you need to connect to your WordPress site using an FTP client. Once connected, you need to go to 可湿性粉剂内容 folder. You will find files and folders created by plugins inside the uploads and plugins folders.