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You will need to connect the Chromecast to the WiFi at your cottage, obviously. Are you ready to proceed with that? if so, and when you are, I will instruct you.
You will need a smart-phone or a tablet, to set up the Chromecast with. Do you have such a device to do the setup/configuration of the Chromecast device?
I'm here still...
OK. Does your iPad have the Google Home app on it? (I wouldn't think so, being that it is an Apple device, but it is faintly possible.)
OK... Is that the Google Home app, though? it should be.
Is your iPad connected to the cottage WiFi? it should be.
OK! then go to this link on your iPad:
(or else go to https://itunes.apple.com/us/app/chromecast/id680819774?mt=8
to get the Google Home app, if you prefer.)
You can setup with Bluetooth or with WiFi. Let's go with WiFi - fewer complexities in it, in some ways.
OK, then. Once you have Google Home on your iPad, by either of the two methods I mentioned - and from the screen-shot you posted to me, I don't think you do - the 'G' app / icon is probably something else - one you have Google Home, then you connect the WiFi of the iPad to the ChromecastXXX (or similar name) WiFi network near you - just look for available wireless networks to connect to, and the Chromecast device should be there for your iPad to connect to.
Then: having Google Home, having connected by WiFi to the Chromecast device...
Do you need further instructions?
If so, in outline: Google Home, once your WiFi is connected to the Chromecast device, should show your Chromecast device, you select your Chromecast device in Google Home, then you
proceed through matching codes on iPad and on TV, then ... by and by you select the WiFi network, which would be the WiFi at your cottage.
And by and by, your Chromecast should be set up for use at the cottage. Enjoy your vacation and your Chromecast, and before you go, please rate my answer - a five-star rating best expresses appreciation of the work I have done.
(If you need further guidance, be sure to let me know and I'll continue helping you.)