Some users are allowed -using permissions- to create or edit workspaces, to access the workspaces page you need to switch to admin mode and then go to Personalized Workspaces option, as follows:
There is a faster way to edit a value on the current workspace - most common case -, as follows:
There are two section in the Personalized Workspaces page, the General section with global information about the workspace, the Mobile SDK & RESTful API section with the credentials to access our RESTful services and the Mobile SDK.
In the Personalized Workspaces page, you can find a Email Settings section with global setting about email and domain.