This video will show you how to cancel Roblox Premium.
Make sure that you are signed in to your Roblox account.
Then click on the cog icon
in the top right corner and select "Settings."
Click on the "Billing" tab on the left side menu.
Select "Cancel Renewal."
You'll be prompted with the benefits
which you'll end up losing
if you cancel your membership.
Click on "Yes, Cancel."
Then select a reason for canceling your membership
or alternatively click on "Skip."
Now your membership will have been canceled.