Like many academic e-books, access can vary through eBooks on EBSCOhost. Some titles may allow multiple people to access at one time, whereas others might be restricted to one. In addition, the amount of material that can copied or printed can vary as well.
Each title will list this relevant information on the record page under Publisher Permissions and Concurrent User Level.
An account is not required to read titles online.
From any EBSCOhost database or the Advanced Search in Discover:
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The EBSCO website has tutorials and a Quick Start Guide on using the app.