USE CHROME. Firefox may fail.

https://discordapp.com/developers/applications/
=> New Application
=> Enter any name for your new bot
=> Click "Bot" in navigation
=> Add Bot
=> Yes
=> Reveal & copy token
=> Give the token to someone who implements the bot (in a PRIVATE message!)
=> If you want to allow other people to add your bot to their servers, choose "public". Otherwise, leave unchecked.

Now for the OAuth2 process (adding the bot).

Click "OAuth2" in navigation
=> Select scope "bot"
=> Permissions: You can leave them all empty for the usual bots
=> Copy & open the displayed URL
=> Select server
=> Click "Authorize"
=> I'm not a robot
=> done