Hey there Jonathan,
I'm very new to blender and have just found out a problem I have.. There is no meters preset in scene - Units, however there is all the other measurements? Do you have any Idea to fix this? also the same happens with placing the human, I can only spawn in a bone. Thanks!
Hey Harry, if for some reason meters is not in you Unit Presets, you can just switch the Length to Metric and leave the Unit Scale at 1. Similarly for centimeters you can leave it at Metric and set the Unit Scale to 0.01.
As for the human, go to your user preferences and enable the addon Rigify. That should do it!