Delay before gameobject set active couritine

Hello,

I try to have a delay for 3 seconds before the game object(two panels) is activated when a button is pressed. I assigned the button on click the panelview() but I could not find how to write the couritine inside as the IEnumerator.

Can somebody help me? Thanks

Here is the part of the code I want to combine the couritine into:

Code (CSharp):

1.    
2.      public void panelview()
3.     {
4.        
5.  
6.         if (totalenergy == 0)
7.         {
8.              panel2.gameObject.SetActive(true);
9.  
10.         }
11.         if (totalenergy >= 1)
12.         {
13.    
14.         panel.gameObject.SetActive(true);
15.  
16.         }
17.     }

 

I use this for delayed action. See usage notes at bottom:

https://gist.github.com/kurtdekker/0da9a9721c15bd3af1d2ced0a367e24e