Tap your profile icon (top right corner of the screen)

Tap "Sign In"

Enter the ID of the account you want to activate your promo code on

Tap "Search" and select the account

Tap the ticket icon at the bottom of the screen on the home page (center of the lower panel)

Enter the promo code

Tap "Apply" to activate your promo code 🤩

Click "Sign In" (top right corner of the screen)

Select "Sign In" again in the menu that pops up

Enter the ID of the account you want to activate your promo code on

Click "Search" and select the account

Click "Promo Code" in the upper panel of the page

Enter the promo code

Click "Apply" to activate your promo code 🥳

Launch the game

Open Inventory (gun icon in the side bar menu on the left)

Go to "Shop" → "Promocode"

Enter your promo code

Tap "Apply" to activate your promo code 😍