Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.

Americans pronounce ease as EEZ (/iz/). You'll hear it in sentences like "This pill will bring you some immediate ease".
Record yourself saying "ease" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 2 sounds. Explore each sound's mouth shape and how it's made.