Use ISBLANK with 4 how-to topics in WPS Sheets; all 4 are available without membership and 0 are membership-related, so you can choose a topic from the index and follow the steps.

How-to Index

#	Topic	Membership
1	1. Enter the ISBLANK function	Free
2	2. Fill in the argument with syntax prompts	Free
3	3. Use ISBLANK in a cross-sheet reference	Free
4	4. Use ISBLANK in a nested formula	Free

How-to Guide

1. Enter the ISBLANK function

Entry point: Formulas tab → formula bar

Open WPS Sheets and select the cell where you want to display the result.
Type the = sign in the formula bar or directly in the cell.
Continue by typing ISBLANK(.
Check the automatic syntax prompt to confirm the function name.
Continue by entering the reference you want to test.

Success Criteria

UI state: The formula bar shows =ISBLANK(.
Next actions: You can continue entering a cell reference and complete the formula.

Tips While Using

Common mistakes: If you do not start with =, the content is treated as plain text.
Environment limits: You need to work in an editable spreadsheet cell.

2. Fill in the argument with syntax prompts

Entry point: formula bar

After typing =ISBLANK(, enter the cell reference you want to check, such as A2.
Make sure the parentheses are complete.
Press Enter to confirm the formula.
Check whether the result returns TRUE or FALSE.

Success Criteria

UI state: The target cell shows a logical result.
Next actions: You can copy the formula to other cells for more checks.

Tips While Using

Common mistakes: Incomplete parentheses or an incorrect reference can cause a formula error.
Environment limits: The referenced cell must be valid in the current workbook.

3. Use ISBLANK in a cross-sheet reference

Entry point: formula bar

Select the cell where you want to display the result.
Type =ISBLANK(.
Switch to the referenced worksheet and select the target cell, or enter the cross-sheet reference manually.
Complete the closing parenthesis and press Enter.
Review the returned result to see whether the referenced location is empty.

Success Criteria

UI state: The formula includes a cross-sheet reference.
Next actions: You can combine it with other formulas to process cross-sheet data.

Tips While Using

Common mistakes: An incorrect sheet name or reference position can affect the result.
Environment limits: The referenced worksheet must exist in the current workbook.

4. Use ISBLANK in a nested formula

Entry point: formula bar

Select the target cell.
Enter a nested formula that includes ISBLANK, such as a formula combined with IF.
Check the function levels, parentheses, and references.
Press Enter to confirm.
Change the referenced cell content and see whether the result updates automatically.

Success Criteria

UI state: The nested formula returns the expected result.
Next actions: After you change the source data, the result recalculates automatically.

Tips While Using

Common mistakes: It is easy to miss a parenthesis when the nesting level becomes deeper.
Environment limits: For complex formulas, it is easier to complete the input in the formula bar.