Here is a breakdown of how to pronounce each sound in the word:
"p" - This sound is pronounced by closing your lips together and then releasing them with a puff of air.
"o" - This sound is pronounced by opening your mouth wide and making a sound that is similar to the sound you make when you say the word "oh".
"e" - This sound is pronounced by making a sound that is similar to the sound you make when you say the word "eh".
"m" - This sound is pronounced by closing your lips together and then releasing them while making a humming sound.
By putting all of these sounds together, you can pronounce the word "poem" as "po-em".