The image shows the Copy Rule window. Under the From part are three options: Variable, Part and Query; Expression; and XML Literal. Expression is selected; its text is:
concat('Hello',bpws:getVariableData('input','payload', '/SyncHelloWorldRequest/input'))
Under the To part is a list for Variable, Part and Query, which has the following selection:
$output/payload/tns:SyncHelloWorldResponse/tns:result