You need to create the .htaccess file. Logon to your server via ftp. Go to the public_html folder (usually where you put your files) and look for a file called .htaccess, and download it. Open it up in notepad and add this to it
Code:
php_value upload_max_filesize 200M
php_value post_max_size 200M
save it as .htaccess WITHOUT the extension or it won't work. Change 200M to whatever you like. The M represents megabytes.
If no .htaccess file exists on your server then you will have to create it. Open notepad and put this in it.
Code:
php_value upload_max_filesize 200M
php_value post_max_size 200M
Save the file as htaccess.txt > Upload the file to your webhost via ftp > Rename the file to .htaccess again no extension using your ftp program. If done correctly the upload_max_filesize and post_max_size should be larger.