Along the toolbar on the left, select options. At the bottom is a section called "Vacation mode/Delete Account" in it, you must check the box marked delete account.
Also, you can simply not log in. Eventually, you account will be deleted due to inactivity.
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It is not possible to delete a RuneScape account.
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Delete Account Code s33302599
An account can be closed via the Second Life official website. Login to account < account tab < delete account < confirm delete account
There is currently no option to delete your RuneScape account.