https://www.cactusforums.com/redemption-gaming-on-lackeyccg/redemption-plugin-for-lackey-ccg-(out-of-beta)/
Start there to download Lackey as that is the easiest way to play online. The redemption discord is where you can find others available to play.
You also can play by using a camera to show your cards to your opponent (and they do the same). This is how sanctioned online tournaments are played. This is also coordinated on the redemption discord.
