Select the cell
Move the pointer to the cell border until the four-headed arrow appears
Click and drag the cell to the new location
Release the mouse button
Or cut the cell with Ctrl+X
Select the destination cell
Paste with Ctrl+V
Select the cell
Move the pointer to the cell border until the four-headed arrow appears
Click and drag the cell to the new location
Release the mouse button
Or cut the cell with Ctrl+X
Select the destination cell
Paste with Ctrl+V