How do I get my slider to appear on the homepage (not in a page or post)

I’m not sure that understand you correctly.

* If you want to add WOWSlider into header (it’ll appear on all your pages including Home page), you should follow the instruction on our website:
http://www.wowslider.com/wordpress-jquery-slider.html#FAQ
You need the first question “I’ve recently ordered WOWSlider. Now I want to add it in WordPress header. How i can do this?”

* If you want to add WOWSlider on Home page only, you should go to Appearance – > Editor, select “header.php” file and add the following code:
<?php if (is_home() || is_front_page()) wowslider(ID); ?>
(where ID is your slider identifier – number) in the place where you want to have a slider.

Actually, this instruction has been provided already in “WowSlider on Home page only in WordPress” topic.
Please read the previous posts and FAQ on our website.