- Select "Settings" from the list of Android Apps
- Select "Wi-Fi Settings"
- Tap and hold on your Wi-Fi network name until a menu will appear
- Select "Manage network settings"
- Find a checkbox next to "Show advanced options" and tap on it.
- Select "Static" from the dropdown menu
- Your router IP could be found in the Gateway sections
Make sure to tap "Cancel" after you are done so you won't accidentally change your device settings.