Open the sticker picker in any channel on ✔𝒢𝒜𝑀𝐸 𝒮𝐸𝑅𝒱𝐸𝑅 and pick Хай.
Sending it on other servers or in DMs needs Discord Nitro.
To add it to a server you manage, download it, then open Server Settings → Stickers → Upload Sticker. Discord takes PNG, APNG and GIF files up to 512 KB.