Okay....Im learning how to use RMXP from Venedian Gardens and Im getting a good grip on it without pictues until i got to where it says, "-Use the switch command and create two switches and change the names to whatever you want. Make sure that the first one is turned on. We will use the second one later.
-Create a new page in the same event (Potion guy) and keep the same graphic. Now look here.
-This is the precondition menu. This means that if any of these boxes are checked, that precondition has to be met. In other words unless that switch, variable, or local switch has been turned on or that condition has been met, then that event will not begin.
-Select the first precondition box named Switch and select the second switch you created.
-Create a message with something like "You did it! Here's a potion!" " Can anyone tell me what this looks like?
When you're editing an event (i.e. you've double clicked on it), on the left is a llittle section called "Conditions". It lists "Switch", "Switch", "Variable" and "Self Switch", and each of them has a check box and another box or two next to them. This is what your guide called the "precondition menu" (a stupid name to call it, really).
If you check one of the "Switch" boxes, the other box lights up, and you can click on the little arrow in it to open the list of switches in your game. Pick a switch (you can name it there too), and click "OK". Now, the events that this particular page of the event says to happen will only happen if that switch is ON.
To change a switch to ON/OFF, double-click a blank line in an event and select "Control Switches..." in the first tab.
You've also referred to creating a new page. At the top of the "Edit Event" window is a great big button called "New Event Page".
If this is the level you're stuck on, I'd suggest you find a better tutorial. Perhaps a video one, or at least one with screenshots. There really are plenty to go around, if you spend 4 seconds in Google looking for "RPG Maker XP tutorial".
This particular tutorial is the very first result, and it looks quite useful.