To download Aptoide you have to download a bazaar or so of play store, then at the bazaar you hit the button on the left that says (download Aptoide), once in Aptoide you want the application you want, and when you look like dira "search other repositories", you give and you take internet, then you choose yours, you give installed by Aptoide (and not via internet).
If you want the download Aptoide repositories repos, update repositories and voila, you'll have to not give to find other repositories. I would say that updating'd like 13mil app to download and 6mil games, but it depends on the area (say) lol