If you are on a mac, you do not, you cannot.
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First, go to the Minecraft folder. Go to the save files. Copy the world you want, and paste it back in. This will copy the world, and make a duplicate.
I believe you mean obfusticated or scrambled text in which case you must paste in §k before the text and §r after. Try it in a book to see if it's what you mean.
Locate your Minecraft folder, then find your save file. Copy and paste this onto your hard drive. Minecraft is installed in your AppData folder (C:\Users\[username]\AppData\.minecraft\) The saves folder should be in the .minecraft folder.
There is no way to copy/paste on roblox for mac. SORRY NOOB!
Type "What is my IP" On google and copy/paste it in your direct connect box if you have your router port forwarded and a server program running on your PC