Increase upload size in your php.ini

Add the below to the relevant php.ini file (recommended, if you have access). Note that for some hosts this is a system-wide setting. However, for hosts running PHP as a CGI script with suexec (for example) you may be able to put these directives in a php.ini file in your Drupal root directory

.upload_max_filesize = 10M
post_max_size = 10M

Add the below to your .htaccess file in your  root directory.

===================

php_value upload_max_filesize 10M

php_value post_max_size 10M