Run the simulation. The mouse pointer changes to show a current arrow, then click on the component. Note that LTspice often draws the current arrow in the opposite direction of what you want. If that happens, and you need the current in the plot window to show the opposite way, you can edit the trace’s formula to add a minus sign in front of it.
If you want a simulation to display the voltages and currents on the schematic, I don’t think that’s something LTspice does. But other simulators, like Tina and Falstad, do.