To play the Splitgate Beta, you will need to download it from your platform's store page. So if you are an Xbox user, you will need to find the game in the Xbox Store.
PlayStations users will also need to visit their platform store to download the game, which can be found at the official store page on the PlayStation store.
Once you find the game at whatever storefront, downloading it is a simple and easy process. On Xbox, there will be an option that says either get or download, and on PlayStation, there will be a button that says add to library.
After you add the game to your library, it should download automatically, and you will be able to play the game while it is in beta.
For PC users as the game is currently only available on PC for Steam - along with this, you will need to have a Steam account.
You can create a Steam account by going to the official steam website, click login, and then hit join Steam. From there on, you will need to download the installer for Steam, install it, and load into your Steam account.
After that step, playing the Splitgate Beta is just a matter of finding the game's store page and clicking download and install just like any free-to-play game on Steam.
That said, start by finding the store page and find a green button labeled play game. Click this, and a pop-up to install the game will appear. From this tab, you will be able to choose the game's install location, select one if you want, or just hit next.
When you hit next, the game will start downloading, and after it is downloaded, you will be able to play the Splitgate Beta on Steam.
Stay tuned for more on Splitgate at Pro Game Guides