You have to follow below steps:
- Login to VPS server as administrator.
- After that find php.ini file on C:\Program Files (x86)\PHP\v5.X location. In php.ini file you can search below line and edit the limit according to choice.
- ini_set('upload_max_size','10M');
- After editing save php.ini file.
- For confirmation you can check the limit in phpinfo.php.