Hi Ruthie. My name is*****'m sorry that you're having this problem. I will do my best to help.
Let's begin by checking for updates to your version of Photoshop.
Choose Help > Updates (this is the preferred update method).
Download the most recent update from the Adobe website.
If an update doesn't resolve the issue, I'll need to know what operating system you have on your computer. If you're not sure, please click this link and tell me what you see:
From the Apple menu, choose About This Mac. Your version of OS X appears directly below “OS X"