discord.js member object code example
Example 1: get discord.js role
let role = message.guild.roles.cache.find(r => r.id === "Role ID");
// The member you want to add the role to
let member = message.mentions.members.first();
// Add role to the member
member.roles.add(role);
// Or add it to yourself
message.author.roles.add(role);
Example 2: discord js channel send
const user = <client>.users.cache.get('<id>');
user.send('<content>');
Example 3: discord js channel send
const channel = <client>.channels.cache.get('<id>');
channel.send('<content>');