I am missing the Share button in Analytics

Permissions are based on the users roles. If the Share button is not on the Dashboard or Datasets screens, then your roles is "vAnalytics Reader". A Reader cannot create content for others, only view existing content. To create a new report, you will need to have your Vyopta admin increase your user role.

Vyopta roles and permissions are set at the role level. There are three views available: vAnalytics Analyst, vAnalytics Reader, and Strict Dashboard Viewer. Each view enables different types of users to leverage Vyopta in line with the requirements of their job.  More details can be found in this article Vyopta User Permissions