Forums Scripts & Popups script to only run when I type the command

I'm still new to mIRC so trying to figure something out.

I would like a script to run only when I type the command !ball15 in chat. Can I target an on text event trigger to my user name/nick or will I need to use an if then else trigger? If I need to use an if then else trigger, how do I get it to trigger for my username?

Thank you for any help that can be provided for this.