Alright, figured it out

void OnGUI () 
{
    if(PauseGame.pause==true)
    {  
       if(Input.GetKey("left"))
       {
         hSliderValue = hSliderValue -0.1F;
       }
       else if(Input.GetKey("right"))
       {
         hSliderValue = hSliderValue+0.1F;    
       }

       hSliderValue = GUI.HorizontalSlider(new Rect(25F, 25F, 600F, 30F), hSliderValue, 0.0F, 10.0F);


         if(GUI.Button(new Rect(25,60,600,20), "Press When Finished")) 
         {


          PauseGame.pause = false;
          Time.timeScale = 1;
         return;
         }
    }
    else if(Time.timeScale ==1){
    update();
    }

}