For all the Kniwwelino-Blockly features to be enabled, the Kniwwelino-Blockly desktop application must be running locally on your computer.
If you are using an online version you will not be able to configure the settings nor load the blocks code into an Kniwwelino.
Installation instruction can be found in the Kniwwelino Documentation Wiki.
If you have Kniwwelino-Blockly already installed, make sure the application is running correctly.