I found a gif that visualizes it pretty decently. You twist the bottom of the handle and the top butterflies open so you can put a blade in.
Mine also has another part you can twist at the top of the handle that adjusts the distance of the blade from the razor body to determine shaving “depth”.
https://goforzero.com.au/cdn/shop/products/Go-For-Zero-Reusable-Butterfly-Reusable-Safety-Razor-Stainless-Steel-Changing-Blades_1200x.gif?v=1757430875
I found a gif that visualizes it pretty decently. You twist the bottom of the handle and the top butterflies open so you can put a blade in.
Mine also has another part you can twist at the top of the handle that adjusts the distance of the blade from the razor body to determine shaving “depth”.