From the Roblox Mobile App

1. Be logged into the account where the membership was bought
2. Tap the three-dots icon in the lower right
3. Tap Settings
4. Tap Billing
5. View your membership status

From a Browser

1. Be logged into the account where the membership was bought
2. Open the gear icon in the upper right
3. Open Settings
4. Open Billing
5. View your membership status

From the Roblox Xbox One App

Memberships are not sold in the Xbox One App. Current memberships will not be displayed in the Xbox One App.