To activate TCM via tcm.com/activate on any device first of all unit to download and install it on your device.  After that open the TCM app and you will find an activation code on the screen noted down and now from another mobile or the desktop visit the TCM activation page  and login with your cable TV provider. At this time you will be asked to enter the activation code that you have received on the screen and just follow the onscreen instructions to complete the activation.