If a gear slot displays the Find button, it means the required Gear Piece has not yet been obtained.
To locate a specific Gear Piece:
Tap the gear slot marked Find.
Review the required Gear Piece and quantity on the Gear screen.
Select the Gear Piece you need.
Tap Find on the right side of the screen.
You'll then see a list of ways to obtain that Gear Piece. Depending on the item, it may be available through:
Campaign Missions
Chests
Store Offers
Other in-game activities
Use the available sources to collect the required Gear Pieces and continue upgrading your Superstar.