Can someone help me with a CSS?

I really like my new wordpress theme:

• but the way
• it formats bullets
• with these silly
• little crosses
• is rather annoying

I think I should be able to change these for something else as the theme has an 'Edit CSS' option. I tried looking at the theme creator's website but to access the support forums you have to 'Go pro' for $48, which (however much I like the theme) I have no intention of doing. So I'm hoping that some kind and clever person can help me change it for free :)

Is is something to do with this bit of the CSS:

background: url(images/list-item.gif) no-repeat 0 .3em;

...and if so what do I change it to?