How to delete a Key of registry by VBScript?

How to delete a Key of registry by VBScript? like the strValueName under Software\Microsoft\Office\15.0\Lync\ConfAddin\test@contoso.com.cn.

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Const HKEY_CURRENT_USER = &H80000001

strComputer = "."

Set objRegistry = GetObject("winmgmts:\\" & strComputer & "\root\default:StdRegProv")
DIM strValueName, strValue
strKeyPath = "Software\Microsoft\Office\15.0\Lync\ConfAddin\test@contoso.com.cn"
strValueName = "UserSetting