Scale...

  The Scale menu item allows you to modify the proportions of
  images you select.

  To scale an image:

  1.  Use the Box or the Scissors to select the image you want
      to modify.

  2.  Choose Scale...  from the Edit menu.

      Paint displays the Scale dialog box.

  3.  For both the x scale and the y scale, click on one of
      the percent buttons to change the scale.  For example,
      clicking on 25% reduces the selected area to one-fourth
      the original size, while clicking on 200% makes it twice as
      large as the original.

      To specify your own percentages, enter a number less
      than 100 to shrink the figure or a number greater than
      100 to expand the figure.

  Additional topics:

  *   Using Menus and Controls

  *   Edit Menu

  *   Overview of Paint