UBB.threads PHP Forum Software Community Forums UBB.threads Version 7/8 Support Age Verification : Change message?

One more item, we have an age verification on our forum so that no one under 13 can register. The message that pops up if someone submits an age too young is:

"Sorry, we do not allow children of your age to register."

I want to change this to something else. Where do I make this change?