type the emoji then type the emoji with a \ in front of it then send it,
this will generate the emoji code

Taking the number of the emoji you used this is the emoji id

your going to put the emoji id into this link

https://cdn.discordapp.com/emojis/[EMOJI_ID]?size=240&quality=lossless

example

emoji ID : 1126571571738333314

https://cdn.discordapp.com/emojis/1126571571738333314?size=240&quality=lossless

If the emoji is animated add a .gif to the url

https://cdn.discordapp.com/emojis/[EMOJI_ID].gif?size=240&quality=lossless

example

emoji ID : 1126571571738333314

https://cdn.discordapp.com/emojis/1126571571738333314.gif?size=240&quality=lossless