Use left and right to change which block you want to use. Click on a block to change it. (Up and down spin it, which will not save) Press S to get the seed. Copy and paste it. Press X to input the seed, and it will open the seed.
Try making cool landscapes, and share your map with other people down there in the comments! All art and programming by me. Love and Fav! Still a lot of features missing, while sometimes things clip into others in wierd ways. Sometimes the program make things look wierd :P