To cancel Roblox Premium on a PC, log in to your Roblox account first. Make sure it’s the account with the membership you want to cancel.
Once logged in, click on the gear icon in the upper-right corner of the screen. This will open a menu where you should select “Settings.”
In the “My Settings” window, find and click on “Billing” from the left-side menu. This will take you to your billing information.
Next, click on the “Cancel Renewal” button. You’ll be asked to confirm that you want to end your Premium subscription.
Finally, click “Yes, Cancel” to confirm. Your subscription will remain active until the next renewal date, at which point it will be canceled.