HP -65 Owner's Handbook Manual page 60

It is easier, however, to switch back to RUN and to move the
pointer to the top of memory (by pressing [fI ) or to the label
(by pressing G189 E¥). Let us do the latter:
Switch to RUN.
Press B.
Switch to W/PRGM.
Press See Displayed Comment
B A
- -
5 - 1/x
To delete the :
Press See Displayed Comment
g - 04 has been deleted.
Notice that the pointer has backed up to the [@ (code 35). To
insert the [n] , just
Press See Displayed Comment
[n]] e 03 has been inserted.
Testing the Revision. To verify that the [[§ key is redefined to
calculate the factorial, switch to RUN and
Press See Displayed Comment
50 720.00 51—120
Figure 4-4 summarizes the editing process. You can tell when
memory is full by observing the display:
One "—" sign indicates
full memory.
Note that if memory is full, and if you try to delete a step, you
will also delete the bottom code; be sure to reinsert it.
You can tell when the pointer is at the bottom:
Two "—" signs indicate
pointer is at bottom.