You won't find any automated way to delete a Roblox account on its website. Use one of the 3 methods listed in the post to delete Roblox.

How to enable two-step verification (2SV) for your Roblox account Having logged into your Roblox account from a desktop or laptop computer, click on the cog in the upper-right hand corner of the ...

With Roblox available on many formats, here's everything you need to know about the game, including tips on how to play safely online.