First make sure you're using the correct screenshot keys.The screenshots should be located under blockland's main folder in your documents. The folder labeled "screenshots".The screenshots themselves should be labled Blockland_XXXXXThe X being the number of your screenshots. 1 being oldest and the highest being the newest.
Go to Documents\Blockland\screenshotsThe Blockland folder is now in the Documents folder.
Them arent at My Documents/Blockland/screenshotsI already said that :C
First of all did you press ctrl-P (default) to take a screenshot?