How can I reboot an application on my Blackberry Curve?

Question by Mean Pie: How can I reboot an application on my Blackberry Curve?
My yahoo messenger app is stuck on my blackberry curve. I accidentally tried to link a contact's address to my actual address book and it's been stuck ever since. I've tried pressing the menu key and it does nothing. All I can do is exit out of the program and then it gives a box with an exclamation point, but no message. So I just need to reboot this application so I can use it. Thanks guys!


Best

google blackberry maps ...