Anyplace means the same as anywhere: in, at, or to a place, when you do not name the place, or you do not mind which place it is. You can use it in questions and with not: Is there a shop anyplace near here? I can't find my bag anyplace. Though actually, this is easy, spoken American English. British speakers almost always say anywhere, and in careful writing anywhere is the word that looks tidy. Anyplace is not a different idea; it just feels more casual, like something you say at the table, not something you put in a school essay. Some teachers will let it pass in a story with American voices and still change it in formal work.