If this is a textbook you purchased for a class, you should:
Sign into MyUSM Portal
Scroll down to UMS QuickLinks
Click on My Textbooks - Current Semester
Look for your Digital Bookshelf to find an online book you've purchased.
If you are still having trouble, contact the Virtual bookstore, eCampus directly:
https://usm.ecampus.com/ for Chat support
877-284-6744
bookstore@ecampus.com
NOTE: Some ebook purchases from eCampus are available right away, but some will require a brief waiting period as a code is imported over from the publisher with eCampus as a go-between.