Go to [esc] and click "save world" if you created it.
No, unless you save a world on your computer files
Move the world into the memory stick in .minecraft
No you can not, once you save it, it is a permanent thing. I'm sorry.
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.
if you want items in minecraft the best edit i know is INVedit. download it, open world iventory and edit it. save it to your world next
You will be able to soon enough.
Ask who ever is hosting the server "cupquake" for the world seed. Then put it in your save folder.
You go to run. Type %appdata%, then into the Roaming folder, into .minecraft, then saves, then pick the world you want to delete, right click and delete.
you can only save if you have the full version
yes, but not on classic
NO!
no