There are two possible answers to this question:
1. If you like, you can use "anymore" as a single word meaning "no longer" when you're talking about time. For example, "My great-grandmother doesn't go water-skiing anymore". But you can't use "anymore" where "more" is followed by a noun ( as in "There isn't any more ice cream") or refers to a noun (as in "Can I have some ice cream?" "Sorry, there isn't any more").
Seems a bit confusing? Don't worry. If you can't be bothered to get your head around that, there's always answer number 2:
2. Forget about "anymore". You never need to use it. Really.