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 Accept a Friend on Roblox - Web From the home page, you'll see a menu on the left-hand side. It has your profile, messages, avatar, and most importantly, Friends. If there’s a number next ...

You can delete a Roblox account by simply emailing the company, but there are a few other ways to do it.