Change the MyPlugin to FB_PAYSME. That should avoid any conflicts. Whatever you change it to, remember it. We will be referencing it while editing our next file.
The next few lines go from version to category. For the sake of this just set the category value to Facebook.
The next item down is type. This is one of two values. Either "world" which means that the plugin actually draws something on our application screen or "object" which means something that isn't physically drawn. We are going to chose object and heres why. While our dialog will appear to the user, it isn't actually going to be part of our browser window. Facebook will open it's own window separate from our app. Make sense? So make sure to choose "object" for the type line(line 11).
Ok, next is rotatable. This is either true or false. True would mean that the object is drawn on our screen and we can rotate it to any particular angle. The type above must be world if this is going to be true. However, we do not draw the dialog and our type is object so change this to false.
While we left the rest commented because we didn't need it, you should read through each line and familiarize yourself with what each means. There is a description at the end of each line.