how do i make extra stem out of this i use cube to...

Totally doable — you can “grow” a stem right out of the apple mesh with Extrude.

Method A: Extrude a stem from the apple (fast + clean)

1. Right-click the apple → Face
2. On the top of the apple, select a small group of faces where the stem should come out (usually 4 faces in a square, or 6–8 faces if you want a thicker base).
3. Press Ctrl + E (Edit Mesh → Extrude)
4. In the Extrude options (or the manipulator):
   • Scale the extruded faces smaller (this makes a “stem base”)
   • Move it up in Y (pull it out)
5. Repeat Ctrl+E a few times:
   • Each time: pull up a bit, scale slightly smaller (nice taper)
6. Shape it:
   • Right-click → Vertex
   • Turn on Soft Selection (press B) and gently move the top verts sideways to give it a little bend
   • Press B + drag (left mouse) to change the soft selection falloff size

Make it look good when smoothing

If you’re using Smooth Preview (press 3):

• Add support edges so the base doesn’t melt:
  • Mesh Tools → Insert Edge Loop
  • Put 1–2 loops around the stem base and maybe one near the top

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Method B (often easier): Make a separate stem and attach it

1. Create → Polygon Primitives → Cylinder
2. Scale it down, place it on top, shape it with Soft Select (B)
3. Select stem + apple → Mesh → Combine
4. Merge the seam:
   • Vertex mode, select the touching verts → Edit Mesh → Merge (small threshold)

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If you tell me whether you’re smoothing with 3 and whether you want the stem straight or curved, I can suggest the best topology (how many faces to extrude / where to add loops).