I'd like to answer your question, but there is not enough information to clarify the question.
If you have only a black and a white lead, with no ground lead, then your system needs to be replaced: it will not meet National Electrical Code.
Tell me about your appliance, your breaker panel, and your access under the house, and I can probably tell you how to make the installation.
Failing that, your best bet will be a licensed electrician.