Veronica,
Place the cursor at the point you want to start copying text from, then
holding down the left button, draw it along the text you want to copy. It
will 'highlight'.
When it's highlighted, click the right-hand mouse button, and on the menu
that appears left click 'copy'.
(As mentioned in the previous post, pressing the 'Cntrl' and 'C' keys on the
keyboard also works, and it is sometimes more convenient and quicker when
you are doing a lot of transferring). But either method works.
Next place the cursor into the field where you want the text to appear, then
right click again and left click 'paste' (or 'Cntrl' and 'V').
Hope this helps,
Chek