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 delete a Roblox account permanently? There is no option for a player to simply deactivate or delete his or her Roblox account under game settings, just like other social media accounts or ...

Those deeply involved in Roblox often purchase a Robox Premium (previously called Builders Club) subscription. There are a few different plans to choose from here based on the amount of Robux you get, ...