If you go to Tobias's site you can just type over the left hand side with your own ideas that will be placed in the mind map. It is a fairly straight forward process. Type over the example on the left hand side and your sentence appears on the mind map. If you indent your next sentence your new subtopic will appear in a different rectangle attached by a line to the main topic (first sentence). If you indent again your next line will show attached to the your subtopic, if you do not indent this sentence will attach back to the main topic. See my picture below. To see the website click here
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