Can you talk with people on Minecraft pc edition? If so, how do you do it?

When you're playing on a multiplayer server (OR an impromptu LAN game), you will be able to communicate with others in-game by pressing the T key to pull up the chat prompt. Alternatively, hitting / will also pull up the chat prompt, but will insert the / as it's expect you to enter a command.

Just remember, in Minecraft… Press T to Talk.

Once you have the chat prompt open, just enter your message & hit Enter to send OR Esc to cancel. You can hit Up & Down on the keyboard to cycle through previous messages you've sent (it's more helpful for commands, but still useful).