When I want to install and upgrade any plugins, it appears that you are required to enter your FTP login to install the plugins. Is there a way to install and upgrade plugins by manually uploading the files instead of having WordPress handle the entire process?
WordPress will only prompt to ask your FTP connection information while trying to install plugins or a WordPress update if it cannot write to /wp-content folder directly.
1. change permissions of folders and files.So WordPress has rgiths to write file or folders to /wp-content
2. if you dont want to change permissions or your cant, just add following line to your wp-config.php file
define('FS_METHOD', 'direct');