To play on the Hypixel Server, you will need to own a Minecraft account for PC/Mac (sometimes known as the Java version), which can be purchased on https://minecraft.net/
Any other version, such as Windows 10, Pocket Edition, or Console versions will not work. Pirated copies will be blocked.
Once it's installed and ready to play, you can join the server by adding it to your multiplayer server list.
Here's a video guide on how to do so: