To throw away the trash in Engpsh, you can say:

"I need to take out the garbage."
"I'm going to dispose of the trash."
"It's time to throw away the rubbish."
"I have to empty the trash can."

Note that in British Engpsh, the word "rubbish" is used instead of "trash," and the phrase "take out the rubbish" is commonly used to refer to throwing away trash.