I didn't understand this: "You can enable saving which posts you have seen locally and then it will tell you how many new posts or replies there are." What do you mean with "enable saving..."?

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On the forum there is a clock icon to the right of the forum name. When you click this it will give you the option to enable remembering which posts you have seen and so you (should hopefully) get accurate indications about how many new posts or replies there are since you last visited a forum.