The screenshot mosaic below shows the click route to confirm whether one is a Contributor (as shown in the example below) or an Owner.
These are the steps visualized above:
Sign in to the Azure portal at http://portal.azure.com
Search for Subscriptions in the search bar and click the search result
Click on the subscription (Ayfie in the example above)
Select Access control (IAM)
Select View my access or Role assignments. The former shows your roles, the latter those of other users.