To add components to the circuit:
In the Insert menu, click Resistor, Capacitor, Inductor, Voltage Source or Current Source, depending on component you want to add. You can also press corresponding toolbar button.
Place cursor to the point where you want new device to appear and click left mouse button.
Notes:
Point where you click the mouse button will be the left pin of the new device.
Circuit components are always aligned to a nearest grid point. It means that component will be placed so that its pins are at grid points.
To insert component in the middle of some wire you can just click on this wire. Wire segment will be split in two and component will be inserted between them.
Shortcuts: CTRL+R - Resistor, CTRL+T - Capacitor, CTRL+L - Inductor, CTRL+U - Voltage Source, CTRL+I - Current Source