so how do i use an original seed to check his world out?
If you want to see what he BUILT then download the file he uploaded and put it in your save file.
If you want to see his world without buildings or construction, start a new save file and paste the seed ID where it says "seed".
Do you even have the game or are you just being weird?
I have it (the linux version), but I'm new at both Minecraft and Linux. I haven't played with any the seeding and I don't see the file he uploaded (Maybe, I missed it). So, the Minecraft file is currently stationed on my desktop. I just right click, open in sun java and boom, digging to my heart's content. I've tried to avoid any kind of wiki or tutorial so as not to spoil the novelty for as long as I can. I'm currently trying to make a pool of lava flow into a lake I built (difficulty with the water system and poor initial design on my part). I've seen the IP slot for multiplayer if anyone wants to get together and build, I'm game in the evenings (central time for a coupla more months).