The answer to this depends on how much you want to move. If you want to move text which is all within one item, then keep reading. If, on the other hand, you want to move information which crosses item boundaries, this gets into structure editing since some database structure has to be managed. See section 3.10 for further information about structure editing.
There are two ways to move text from one item to another. The first
option is to use X-Windows cutting and pasting. To do this, simply
click with the left mouse button at the beginning of the text you want
to move, hold the button down, and drag the mouse to the end of the
text. This text is now in a buffer and can be pasted in by moving the
mouse into the item where you want to paste the text and clicking once with the left
mouse button to get the cursor in the right place, then clicking with
the middle button to paste the text. This is the same as other
X-windows applications handle this.
The second method is to use the Emacs-like deletion commands that put the killed text into a kill buffer. These commands are ctrl-k, meta-k, meta-D, and meta-H (see section 4.3 if you don't know what they do). As long as these are done in sequence, the killed text will be appended to the buffer. As soon as some other command is issued, appending will stop, but the buffer will remain until another kill operation reinitializes it. You can then use ctrl-y to `yank' the text into the item where the cursor is at that moment.
It is important to understand that this doesn't work across item boundaries.