There are comprehensive manuals available for Bentley OpenBuildings Energy Simulator.
The easiest way of accessing the manuals via the software is to simply press F1. This will display all product documentation, and you can scroll down to Building Design.
For example, in Update 8:
OpenBuildings Energy Simulator can be found as below:
You can also access the manuals by going to File > Help > Help Contents. At this location you can find additional resources such as links to the Bentley Institute for training and to the OpenBuildings Communities page.
Note the software will automatically open an Online copy of the manuals in your internet browser. We would recommend bookmarking this for easy access.