As a reseller, you provide support for your customers. You need to contact on your clients behalf as you are responsible for all communications between yourself and your hosting customers – you are, after all, the business owner! You will have the ability to build your hosting website, set up your plans and pricing, install scripts, and fix certain aspects of your clients' sites.
Of course, M2host is always there for our resellers to support you 24/7. You may contact us any time for high-level technical or server issues. We are responsible for providing you with the disk space, bandwidth, and features you need to resell, and we are always happy to help you with issues related to these items.