So here is my Code:

void randomline(){
 for (int i=0; i< 75; i++) {
   mouseReleased();
 }
}
void mouseReleased(){
 smooth();
 line(miceX, miceY, random(800), random(70));
}
void MousePressed(){
 miceX= mouseX;
 miceY = mouseY;
}


When I call all my functions together in draw, I can't figure out how to do the following:
Not draw until something is clicked
only draw once, instead of continually drawing.

Right now it just wants to draw from the corner, which happens to be where the play button is (I checked)
I'm thinking I need some sort of if/then structure, but where?  How do I stop the corner problem?

I assume you wanted your sketch to do something like this:

Code:

void setup(){
  size(400,400);
  background(255);
}

void draw(){
  
}

void randomline(){
  stroke(0);
  smooth();
  line(mouseX, mouseY, random(width), random(height));
}

void mouseReleased(){
  randomline();
}
 

Notice that you were kind of doing things backwards. You want to create a custom method called randomline() which handles your drawing. All it does is draw a line from the current mouse position to a random spot somewhere on the screen. Then you want to call this method every time the mouse is clicked. So in the mouseReleased() function, which is a standard Processing function, you simply call your line drawing function to draw a line once every time the mouse is clicked. Is this what you were looking for?