Place the cursor at the start of the blank page
Press Backspace or Delete
If the blank page is caused by extra paragraph marks, select them and delete them
If there is a page break, click before it and press Delete
If there is a section break, remove the section break
Reduce bottom margin if the blank page is caused by formatting
Check for extra spaces or line breaks at the end of the previous page and delete them
On the toolbar, go to Format
Select Line & paragraph spacing
Adjust spacing if needed to remove the blank page