Larry, I suspect you are going to need to be a little more specific if you want an answer.
Are you having trouble binding the H Plus to the ST16S - is this the GUI you are referencing? If so, the H+ owners on this forum ARE able to have the H+ and ST16S bind (connect). If your unit is NOT binding, you need to explain the steps you are performing so we can see where the failure is occurring. Failing that, you will probably need to contact Yuneec Customer Support. Using the Chat feature is probably the quickest but if the issue is detailed, the phone callback is probably required.