U:X:XXXXXXXX
To find your Steam ID:
- Open Day of Defeat: Source
- In the main menu, go to "Options"
- Go to "Keyboard"
- Click the "Advanced" button towards the bottom of the window.
- Make sure that the check box for "Enable developer console" is checked.
- Click "OK" and apply your settings.
- Join any public server (note: you cannot create your own server for this task)
- Open your console by pressing the tilde (~) button on your keyboard.
- In the console type "status" (without the quotes) and press enter.
- Your Steam ID is located next to your username in the list.
Do not give anything more (or less) than that. That is your Steam ID.