If you are unsure of the Version of DNN (7.0.1 etc) or the Edition of DNN (DNN Platform, Evoq Content, etc..) that you are on it is very easy to locate this information to include with your support request.
Start out by logging into your site with "Host" or "Superuser" access. Once in the site you can navigate to "Host" -> "Host Settings". You can get here either via the control bar if on newer versions of DNN or via your site's menu structure if an older version.
Once on this page at the very top of the first section you will see information on version number, displayed in a set of 3 pairs of numbers with .'s between them. Such as 07.03.02. This is the version information that is important to include with all DNN related support incidents.