A game on VASSAL plays out much like a game on the table top. Moving models can be done using either the shortcut keys or by measuring a distance and then placing a model. Multiple models can be selected and moved at a time using the short cut keys if necessary.
Using the Ruler threads for measurement can take some getting used to, the basic procedure is as follows. Click the Red, Green, or LOS button on the menu bar. Then click and drag from the beginning point of a the distance you wish to measure to the end point, release, click. In short: Click and drag, release, click. This will lock the ruler. To release a ruler click on the Red, Green, or LOS menu button as appropriate.
AoE attacks and deviation, are simple on VASSAL. Firstly measure out the distance of the attack using the ruler threads. Next click the Counters button, select the AoE tab, click Deviation, and drag the center point of the template to end of the ruler thread. With the template on the board right click and choose Rotate Freely, click on the ‘4’ and drag and release with your cursor over the model that made the attack.
With the template aligned, roll for direction and distance (be sure to declare the order), the numbers on the template indicate direction, each ring is exactly 1” with the first ring being 1” from the center. Choose an AoE template from the counters menu and place its center as appropriate on the deviation template. Right click and select delete when you are done with the templates.
Spray templates are used as followed. Firstly be sure to declare the target of the attack. Open the Counters window > Spray. Click and drag the relevant template onto the board with the narrow end in B2B with the attacking model. Right click the spray template and select Aim, face toward the target and then fine tune positioning by click and dragging the template.
All of the tokens in the counter menu can display a numeric overlay in the same way models can.