Once you reach 5 posts you'll be promoted to Bottle Rocketeer and will allow you to do things like add a signature from the Settings link top right. Debris can accumulate to a point where they will bog down a computer. There is a setting in the options that allows you to set the maximum amount of debris the game will keep and track. You can set this to zero, save your game, load the game then set the debris back to a value acceptable for you. Try downloading some of the rocket designs people have posted for ideas on how to build better rockets. Cheers! Capt'n Skunky KSP Community Manager