How to Disable WordPress Plugins Without the Admin

1. Determine the address you will need to access your WordPress host through FTP. Typically this will be the same as the URL you use to access your website in a browser, but some hosting providers are different.
2. Connect to the FileZilla Project website and download the appropriate package for your operating system. FileZilla is available for Windows, OS X and Linux. The installation process will vary according to your operating system, so follow the instructions provided with the download.

3. Launch FileZilla and enter the URL, login name and password used to connect to your hosting site into the corresponding fields in the application window. Click the 'Quickconnect' button to connect.
4. Navigate to your WordPress plugin directory in FileZilla by double-clicking folder names as you would in Windows Explorer or any similar program. You may need to know where WordPress has been installed in relation to your home directory. From the WordPress directory, open the wp-content directory and then the plugins directory.
5. Right-click on the name of the problematic plugin directory and select 'Rename' from the menu. Type the new name into the field that pops up. If you do not know which plugin has caused the problem, temporarily disable all plugins. Right-click on the plugins directory and rename it.