If it's an electric waffle maker, plug it into an electrical outlet and turn it on, allowing it to warm up before using.
If it's a stovetop waffle maker, put it over a heat source, such as your hob.
If it's neither of these, you are likely trying to make waffles with something that is not a waffle maker. Please check the 'waffle maker' in question and compare it to pictures of waffle makers you will find at
https://www.google.com/search?q=waffle+maker&tbm=isch&gws_rd=sslGood luck in your waffle-making adventures.
