Press your lips together. Air flows through your nose. Vocal cords vibrate.

Americans pronounce mug as MUHG (/mʌg/). You'll hear it in sentences like "The ragged beggar hugged the ugly mug".
Record yourself saying "mug" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 3 sounds. Explore each sound's mouth shape and how it's made.
The textbook way isn't wrong — it's just not how anyone actually says it.
In "mug", the "g" is not released — the articulators get into position but hold without the burst of air. Air stops but there's no release burst — the articulators hold position.