Is there a command button on the iPad keyboard? If so how do you locate it?

When using the Copy/Paste function with the on-screen keyboard, you need to highlight the word/object - than use the built in copy/paste features.

Select and edit text on iPad - Apple Support

iOS screen keyboards do not have command buttons, those are only one hardware keyboards. What exactly do you need it for?

On a hardware Keyboard it would have the ⌘ symbol on it.