Measure your tin: top rim across, base across, side depth. For ovals, diameters are the long axis; ratio sets the short axis. Seam allowance is the extra length so the wrap actually closes.
Crown
Bell raises the centre of the strip — that becomes the front of the crown when the ends glue at the back.
Trim .
Clip art
Tap a motif to include / exclude it. Recolour the starter star with the chip, or replace it with your clip art.
Edge string
Seam overhang (0.25", right edge)
Click any placed motif to spin it 15° — shift-click spins back. Shuffle resets spins.