Enabling more images in post.
 

I am trying to create a new thread, but it limits my number of images that I can load.

I am a new Admin, and would like to enable users to post 20 images at a time.

See below:

The following errors occurred with your submission:

1. You have included 12 images in your message. You are limited to using 4 images so please go back and correct the problem and then continue again.
   
   Images include use of smilies, the BB code [img] tag and HTML tags. The use of these is all subject to them being enabled by the administrator.

How do I change this to enable users to post more pics?