When creating or uploading a new Dataset you have to set who can view, download, edit and manage that Dataset. By default only owners can edit and manage datasets, anyone can view them.
In order to modify the Dataset Share options settings, On the detail page of the dataset click the Share link in the menu.
Through the Share options Settings Panel you can add or remove options for users and groups. The picture below shows an example.
You can set the following share options:
View (allows to view the dataset).
Download (allows to view and download the dataset).
Edit (allows to change the dataset metadata,change attributes and properties of the datasets features and change the dataset style).
Manage (allows to update, delete, change share options, publish and unpublish the dataset).
When assigning options to a group, all the group members will have those options. Be careful in case of editing them.
Click on Save link in the menu to save these settings.