Creating a PHP.INI file....trouble with uploading limit with GoDaddy hosting

Hi!

I have recently created a GoDaddy hosting account but find that the upload limit is too low. I know that I need to change this as discussed in the following post http://drupal.org/node/301144....but the problem is that accoriding to GoDaddy there isn't a default php5.ini or php.ini file I need to create one. Being a newbie I have no idea what this file needs to contain in terms of coding. I have tried with just including the following but it doesn't seem to work:

memory_limit = 64M
post_max_size = 64M
file_uploads = On
upload_max_filesize = 64M

Has anyone got an idea of what I can do?

Regards
Dan