When you have kidney disease, your kidneys are no longer able to remove waste effectively from your body or to balance your fluids. The build up of wastes can change the chemistry of your body causing some symptoms that you can feel, and others that you don't.
Reference to a range of cells is typically of the form (A1:A6), which specifies all the cells in the range A1 through to A6. A formula such as =SUM(A1:A6) would add all the cells specified and put the result in the cell containing the formula itself.
This step in the tutorial uses the mouse pointer to enter the cell references for the formula into cell D2. 1  Click on cell D2 to make it the active cell. 2  Type the equal sign (=) into cell D2 to start the formula. 3  Click on cell C1 with the mouse pointer to enter the cell reference into the formula. 4  Type a plus sign (+).