The sentence is imperative meaning the subject is (you)
By reading and finding the main thing they talking about
You can recognize this spider by its white stripe markings on its legs and body. The aedes aegypti mosquito is also called the yellow fever mosquito. Unlike most mosquitoes it bites in daytime and indoors as well as outdoors. This mosquito also can carry dengue.
Because it ended up helping to make the story work just write a long pargraph that doesnt make sence in edgunity and it would give you 100%