You would need a step-down adapter, such as this with a 55mm thread into your kit lens, then a 52mm thread for the wide-angle converter.

Unfortunately... you will very quickly discover that these wide-angle adapters are not worth the money, however tempting they may appear.
I'm certain their entire purpose in life is to teach poor unsuspecting newbie photographers the meaning of the word 'vignette'.
At anything below 30mm focal length on your kit lens, you'll be able to see the dark circle round the edges of the frame formed by the adapter - & because your viewfinder only shows about 90% of the frame you're about to take, you discover that after you take the shot.
Also, as mentioned in comments, they are really unsharp. Mine doesn't display huge colour aberration, but it definitely adds a hazy glow to everything that disappears as soon as the adapter is removed.

Reason I know this... I fell for it too as a newbie. Used it once, put it in a drawer.

I would seriously consider saving up for even the cheapest 'real' wide angle lens.

Edit:
I dug mine out of the drawer & took this less than spectacular picture of the view from my workroom window @18mm with a 0.43x adaptor [so a 0.4x will be even worse] ;)
It's not out of focus, honestly, it's just not sharp across the entire frame.

Click for full size [but only jpg 60% quality to keep file size down]

Late thought, for any other newbies who read this.
Exactly the same false economy applies to cheap filters, UV, CPL, ND etc... don't fall for it; buy one good filter, bigger than you'll ever need, 77mm or so minimum, then get adaptor rings for all your lenses.
One purchase, many years of joy.
Far better than a drawer full of crap ...cheap stuff you'll never use again.