If you scan wireless networks and your WiFi network is not shown on the available list, you can add wireless notwork manually on HTC One by entering SSID for your network. Add network manually on HTC One by following the instruction:
1. Open "Settings" App
2. Tap "Wireless"
3. Tap the three dot button on the top right and choose "Add Network"
4. Enter "Network SSID"
5. Choose the security type and enter password if needed (Security types are: None, WEP, WPA/WPA2 PSK/ 802.1 x EAP)
6. Mark "Show advanced options" to configure: Proxy Setting, IP Setting, and Key Index
See Also: How to See Wireless Networks on HTC One