In subway parkour, you can change the avatar frame by the following steps:

1. Click the "Settings" option in the upper right corner of the game interface;

2. Find the option of "Replace avatar box" in the setting interface;

3. Select your favorite avatar box and confirm the replacement.

Expansion: In addition to changing the avatar box, players can also change nicknames, modify personalized signatures, upload avatars and change clothes in subway parkour. Dress-changing allows players to have more freedom in the game, and also allows players to show their own style in the game.