Hi,
First, please need note that you also need to enable the plugin and provide the API secret in the corresponding setting of the plugin. Otherwise, if both of these are not done, the plugin won't do anything on your website.
Now, I don't understand your last sentences:
Is this all done through Analytics - sorry, if this is an obvious question. I'm not a specialist in Analytics - can you point me in the right direction as to where I will find the above information/settings.
What does "Is this all done through Analytics" mean ? Are you asking if the plugin sends the data to GA ? If so, the answer is of course yes. Or are you asking if the plugin needs GA to be reachable to be able to send the data to GA ? If so, the answer is also yes. Or are you asking something else ?
Also, I don't understand what information/setting you're looking for with "can you point me in the right direction as to where I will find the above information/settings" ?
Are you talking about the settings of the plugin ? If you've entered the measurement Id, I can only suppose you've done this in the settings of the plugin and thus you've already found that setting page.
Are you saying that you're wondring if you need to setup something in your GA account ? If so, the answer is no.
Or are you asking where to find the API secret ? In that case, here is a tutorial about this:
www.monsterinsights.com/docs/how-to-crea...l-api-secret-in-ga4/
Or maybe something else ?