TDS internet modems come fully supported by TDS Tech Support and are pre-activated too. If however you are using your own modem you will have to call TDS to activate the service. You can call at 1-844-343-1172 for guidance.
If you are looking to activate your HD set-top box you can do so by logging into your online TDS account. Go to Manage Devices, where you will find a list of equipment. Find the one that is yours, input the serial number printed at the back of HD set top box you own, and activate.