A question about some code.

Hi. This is my first forum post. I do not currently own an Arduino, but I am already creating a code for a project. Nothing I need is immediate.

Where would you put the code for a PIR sensor in a code for an LED light show. I just do not know how it would be coded. Any advice would be appreciated.

The short answer might be:
the code goes within

void loop()
{
// your code here
}

The real answer: You have not provided enough info as to what the code is to do.

The code will be used so that when you walk into the room, a light show starts. I just have no idea how to code it.

If you open the IDE, and go to the "file" you'll find lots of examples of how to program different devices.
Is the "LED light show" anything to do with this?