You mean Maevar sent you to get the Amulet of Talos from Weather Mistress Ada, right?
Remember that your quests will be entered in your journal, so if you forget what exactly was required from you, you can look it up.
Anyway, you need to enter the Temple of Talos at night when it's dark. Then you'll find Weathermistress Ada lying on her bed in the small room on the left. Her amulet will be in the chest next to her bed.
Good luck! [img]smile.gif[/img]