You should have the CommuniGate Server installed and running before you install the CommuniGate IMAP module. Use the CommuniGate Installer to place the IMAP module IMAP into the Modules folder that has been created inside the CommuniGate Folder in your System Folder. Restart the CommuniGate Server.
After the module was installed and the CommuniGate Server has been restarted, login as the Postmaster and check that the IMAP item appears in the Monitors section of the Server menu.