In an unlicensed state TTerm Connect offers limited functionality, allowing server configuration but disallowing any host connection. It is likely that TTerm Connect is either not licensed or in a state where the license process has not been completed.
Login to the Administration Portal and navigate to the Server License page to confirm the license status. See the knowledgebase article on How to License TTerm Connect.
If you are not seeing any host connection shortcuts on the desktop, but are also not seeing a message about licensing, your user issue is likely permissions based. Refer to this knowledgebase article for more detail.