How do you add a spoiler in a post

So how do you add a spoiler in a post

 

See that plus thing? Click on it.

After you click on the plus thing. You'll see that menu, click on Spoiler (obviously), and then it'll tell you to name the spoiler, after that, you're done.

 

Click the box with a plus in it titled "insert..."
Press the Eye with a line through it titled "spoiler"
Enter text under the text that shows up.

 

thank you!