The definition of Climax in the Webster Merriam Dictionary is
-the most intense, exciting, or important point of something; a culmination or apex."the climax of her speech" it's Synonyms (similar words) are :highest point, peak, basically in the story you need to find the highest or the main part of the story there 

There are five parts in the story
Exposition= The beginning
Rising Action= Where the story comes together
Climax= The rising point of the story 
Falling Action= Where the Climax has ended and things start to slow down
Resolution= The ending / the part where the reflection/idea of the story is told

Now I hope you'll be able to understand what I told you and find a way to figure out the Climax of the story now by yourself :)