The Quick Match option goes away if one or more of your friends are playing. Quick Match is intended as an alternative when there are no friends to play with, but since you have friends online you should play with them!
If you really want to play Quick Match but your friends are online, you can do so by searching for Alphabear Hustle on Snapchat's Discover screen and launching the game from there. To do so:
- Launch the Snapchat app.
- Tap the Discover button.
- The Discover screen should come up. Type "Alphabear Hustle" (without the quotation marks) in the Search field.
- The Discover screen's contents should narrow down to show the Alphabear Hustle game as an option. Tap it.
- Wait for the game to load.
- Tap the "Play solo" button.