No letter could be found about account deletion. So perhaps the best to do: use the link to write them an email or ring them, requesting deletion of your account.
UPDATE: apparently you can get your account deleted using a trick suggested by one of our visitors. Read the comment below.
Enlace de la terminación directa: https://www.rapidshare.com/#!help/rapidshare-ag_contact
Publicly visible text/images often aren't properly deleted even when you succeed in deleting an account. Try editing or deleting them manually before deleting the account itself. If you're unsure what happens to your tracks you can always contact RapidShare and ask personally. By the way, deletion requests don't necessarily mean your data will actually be deleted (e.g. due to legal obligations).
If you signed up for RapidShare using a third-party login such as Facebook or Twitter, you probably want to revoke all access from RapidShare. Click the icon below to find out how.