Shopstar does not integrate with Wordpress but there is a very quick and easy way to link your Shopstar shop with your Wordpress website :)
Create a menu item on your Wordpress website
Call it Shop (for example)
Link it to your Shopstar shop (shopname.shopstar.co.za or you can even get a sub domain if you already have a domain for your main site: shop.shopname.co.za)
Make sure your Shopstar shop is in a similar design style as your Wordpress website and there you go :) You're done!