This is a dialog page. The dialog should come up almost instantly, unless things are very slow (either the server, or the internet, or your client). If the dialog doesn't come up at all, some possible causes are that you have the dialog gadget turned off in your preferences, or you have javascript turned off in your browser, or you're using a really old browser.

Template:Assistant:Add action-test/start/table-named Template:Assistant:Add action-test/start/get-action Template:Assistant:Add action-test/unsupported Template:evalx Template:Dialog/ifsupported