I need help how to set my result value in cell (F2, F4:F14) to BLANK

G H I J Kids sold Cups sold (boz) (12 oz) 54 52 Hours Morning Afternoon Evening Kids Sold 5 2 110 64 Cups Sold 124 248 161 cw coco 28 18 1 Shift 2 Morning 3 Afternoon 4 Afternoon 5 Evening 6 Afternoon 7 Evening 8 Afternoon 9 Evening 10 Afternoon 11 Evening 12 Afternoon 13 Evening 14 Morning 15 Afternoon Afternoon Sales over Profit $100 128.59 110.17 best FALSE 61.66 FALSE 37.22 FALSE 47.00 FALSE 54.52 FALSE 63.54 FALSE 75.20 FALSE 77.46 FALSE 89.11 FALSE 125.21 FALSE 163.18 FALSE 188.75 best 10 23 13 31 36 54 70 74 76 Step Instruction Earned Possible Blank cell [F2] on sheet (Weekly Sales) was not detected in the submission. Engine reported the failure as 'In the Cell(s) 'F2' of Sheet Weekly Sales', the 'Formula Result Value' was not set to '[BLANK' 0.129 Blank cell [F9] on sheet (Weekly Sales) was not detected in the submission. Engine reported the failure as 'In the Cell(s) 'F9' of Sheet 'Weekly Sales', the 'Formula Result Value' was not set to [BLANK' 0 0 0.129 Blank cell [F14] on sheet (Weekly Sales) was not detected in the submission. Engine reported the failure as 'In the Cell(s) 'F14' of Sheet 'Weekly Sales', the 'Formula Result Value' was not set to '[BLANK) 0 0 0.129 Blank cell [F7on sheet (Weekly Sales) was not detected in the submission. Engine reported the failure as 'In the Cell(s) 'F7' of Sheet Weekly Sales', the 'Formula Result Value' was not set to '[BLANK) 0 0 0.129