OK, here's how you can create a button on your sheet that will clear the cells every time
you click it.
1) Make sure your Forms toolbar is showing. (From the menu choose View > Toolbars. Make sure 'Forms' has a check next to it, if it doesn't then select it. This will show the toolbar.
2) On the Forms toolbar, click the button of the button and then draw out a button on your sheet where you want it.
3) When you release your mouse button, a window will open up that says 'Assign macro'. In the field below that says 'Macros in:', select ThisWorkbook. In the fiels at the topn, where it says 'Macro name', backspace out whatever's there (probably something like Button1_Click) and replace that with ClearSpecifiedCells and then click 'New'.
You will now be in the vb editor. Simply paste this line:
Range("A1:B4, D5, E7, F2:F5").ClearContents
in between the lines that say:
Sub ClearSpecifiedCells()
and
End Sub
Now, replace those example ranges with the real ranges you want to have cleared out.
When you're all done, press Alt+Q to close the vb editor and get back to your sheet.
You can now right click on the button and choose Edit Text and then replace the existing text there with what you want. (ie. Clear cells) - or whatever suits you. When you right click the button, you'll see it surrounded by some dotted lines & dots. You can use these to move and resize your button to suit.
Now, whenever you click the button, the range(s) you specified in your code will be cleared out for more entries.
Does that help?