Remove the first semicolon on the line. Semicolon pretty much means, “this is the end of this line of code”.
Now it says ‘XRSocketInteractorTag.CanSelect(IXRSelectInteractable)’: no suitable method found to override
It seems like you don’t really know what you’re doing. If you’re following a tutorial, make sure you follow it closely, any error will make it so your code won’t work.
If you use the override keyword when you define a method, it means that it’s “writing over” the same named method in a parent class to do something different.