Click the inventory button or press I to to open the inventory window. Double-click the weapon you received. Equip the weapon, and talk to ClairWright.
Clair Wright: Let's take a look at your equipment! Click the Clair Wright: Character Information button in the menu or press Clair Wright: C to display the window. The boxes on Clair Wright: top show the equipment you're wearing. NakanoAzusa: All I have is a weapon, clothes, and a pair of shoes. Clair Wright: Well, everyone starts from nothing, so don't feel Clair Wright: too bad. Clair Wright: I'll give you one more piece of equipment for a Priest. Clair Wright: Here, take this weapon. NakanoAzusa: I already have one of those. Wait, where were you NakanoAzusa: keeping that? Clair Wright: Never mind that; click on Inventory from the Clair Wright: menu or press the I key. Either double Clair Wright: click the weapon I gave you or drag it to the Clair Wright: weapon slot on character information window NakanoAzusa: That's simple. Clair Wright: Equip the weapon I gave you and talk to me again. Clair Wright: There's a reason I gave you an item you already have; Clair Wright: you'll need it for your next quest, so don't throw it Clair Wright: away!
Reminder Dialog
Clair Wright: The easiest way to equip is to double-click the item's Clair Wright: icon. It's best to equip the strongest items you have!