There are four options for adding a new concept: (a concept can be a topic, keyword, or an idea)
1. Use the green plus button located in the bottom right corner. (pic. 1)
2. Double click the left mouse button.
3. Drag a concept from the related concept section. (pic. 1)
4. You can also add a concept and a link at the same time by using the Subtopic button when you select a concept.
This will bring up a window for adding a new concept. There you may write the name of the concept (A) or choose an existing concept from the bottom selection (B). (pic. 2)
In case you need to rearrange your concept map you may use the function to move multiple concepts on the map at the same time, hold down the shift key and drag your cursor while holding down the left mouse button over the concepts you wish to move.