Minecraft – How to delete and reinstall agrarian skies

This is a config option to lock NEI in Recipe Mode only. It's designed for people (like me) who want to commit to a Survival game, but can't help themselves when it's so easy to cheat in items. This option is on by default when you download NEI.

You can turn this off in the configuration file. Go to the config folder (probably C:/Users/YourName/AppData/Roaming/.minecraft/config) and find NEI.cfg. Open it with Notepad, and change the line that says lockmode=0 to lockmode=-1. This will unlock the option to switch to cheat mode in the options menu in-game.

If that doesn't work for whatever reason, cheat mode can be manually set by changing the line that says cheatmode=0 to cheatmode=2.

After looking around a bit, there appear to be two possible reasons for that.

Firstly, selecting a new world does not work, since the skyblock is not generated like that. If you don't have a savegame already for some reason, you can download the map here. Put it in your saves directory inside your directory for AS, launch the game and select that world.

If you use that savegame and still spawn in the void, here's a quote by jadedcat herself:

If you spawn and fall through the void swap to creative and fly up. Use /jspawn set to set the spawn to the platform.