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 ...

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

Fix #2: Uninstall Roblox Player and delete the Appdata folder. If everything is updated but Roblox is still crashing, the next solution that you can try is to completely remove the game.