Accu-Chek Performa Owner's Booklet page 50

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6. Squeeze the bottle until a tiny drop forms
at the tip. Touch the drop to the front
edge of the yellow window of the test
strip. When you see
enough control solution in the test strip.
Wipe the tip of the bottle with a tissue
then cap the bottle tightly.
flash, you have
7. A result appears on the display, along with
a control bottle symbol and a flashing
"L." Do not remove the test strip yet.
Press once to mark it as a Level 1.
If you tested the Level 2 control, press
a second time.