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To call a function in JavaScript, you need to follow these basic steps:

1. Define the function with a name and any necessary parameters:

javascript
function functionName(parameter1, parameter2) {
  // code to be executed
}

2. Call the function by using its name and passing any required arguments:

javascript
functionName(argument1, argument2);

Here's an example that shows how to call a function named greet that takes a parameter name and displays a greeting message:

javascript
function greet(name) {
  console.log(`Hello, ${name}!`);
}

greet('John'); // output: Hello, John!

In this example, we called the greet function and passed the argument 'John' to it. The function then executed the code inside its block and displayed the message "Hello, John!" in the console.