If you are using Michgan ELT digital products in your course, your students will need to register in order to use the product.  The student can go directly to the https://michelt.ublish.com website catalog and purchase access to the product. 

Detailed instructions on how student register access is available in the Student Support Knowledge Base here: https://micheltsupport.ublish.com/a/solutions/articles/241657?portalId=74843