You can get a blank circuit by choosing "Blank Circuit" from the "Circuits" menu. You will need to add at least one voltage source to start the simulator.

To add components or a wire choose one of the "Add...." options from the "Draw" menu. Note that common components have keyboard short-cuts to select their add mode. When in add mode the cursor changes to a "+". Click and drag the mouse to add a component.

Components may be moved and resized in the selection mode. When in selection mode the cursor changes to an arrow. Choose "Select/Drag Sel" from the "Draw" menu or press "space", or press "escape" to go in to selection mode. Hovering over a component will highlight it and show information about that component in the info area. Clicking and dragging on a component will move the component. If you click and drag on the square handles or hold down the ctrl key this will resize the component and move the terminals.

Wires only connect at their ends and not in the middle therefore you have to draw each segment of a wire separately. If the simulator spots unconnected points it thinks you intended to connect it will highlight these with a red circle.

Many components have adjustments that can be made using the edit function explained above. For resistors, capacitors and inductors you can conveniently set the value from the E12 range by rolling the mouse wheel when hovering over the component

The File menu allows you to import or export circuit description files.

The Reset button resets the circuit to a reasonable state. If the simulation is paused then hitting the Reset button twice will restart it. The Run/Stop button allows you to pause the simulation. The Simulation Speed slider allows you to adjust the speed of the simulation. If the simulation isn't time-dependent (that is, if there are no capacitors, inductors, or time-dependent voltage sources), then this won't have any effect. The Current Speed slider lets you adjust the speed of the dots, in case the currents are so weak (or strong) that the dots are moving too slowly (or too quickly).