No problem. Installing API scripts happens on the Game Management page. In the Settings menu, there is an entry for API Scripts. See: https://wiki.roll20.net/Game_Management#API_Script
.. Of those two, I've not used the CommandDoors one. Matt's Door Script is by far the most popular on the forum. I've made a few minor tweaks to it to make it a bit more robust, but I've not actually set it up. 1) To create your Door token, it uses a Rollable Table Token. To to the Collections tab on the side bar in game and go down to the bottom and create a Rollable Table (call it something like Doors). Add 2 items to it, one for the door when closed and another for when it's open. (you can add as many doors as you like here, and choose them later). When you have your images in there, click the Token button next to the Rollable Table listing to create a Rollable Table Token. The token must be named "Door" initially. See: https://wiki.roll20.net/Collections#Creating_a_Rol
... 2) Create the Switch token. This can be any token you want. It will be visible to the players and used by them and you to manipulate the door. It must be named 'Switch'. Double click the token to bring up the token properties. The bars are used for various things, but at a minimum, you need bar 3 to be 0 / 1 . 0 is the index of the closed door in the Rollable Table Token, 1 is the index of the open door. (feel free to swap those if you put the open door first) The index number starts at 0 and counts up. 3) Draw a line on top of the door token where you want the dynamic lighting drawn. 4) Link them by selecting all 3 and running !DoorLink (type it in the chat) Now you should be able to select the switch and run: !DoorOpen !DoorClose to manipulate the door. Hope that helps! Read through his post a few times after reading the above and make sure I didn't miss anything.