Metaphors and similes are both comparisons between two things. Similes are comparisons that use like or as, while metaphors do not. An example of a simile would be:
"I ran as fast as the sun."
This is a simile because it uses as to compare running and the sun. This would be an example of a metaphor:
"She is a bright sun."
This is a metaphor because it is comparing the girl and the sun without using like or as.
Now that you know what metaphors and similes are, all you have to do is read the poem to look for some.
Please let me know if you need any more help. Hope this helps! Good luck!