Oliver,

You said that you added HTML code, and the way that is done is to use the
insert HTML code fragment, which creates a visible frame/box on your
Publisher file page. If you made that box very small, you may have a hard
time seeing it, so perhaps go to that part of the page where you inserted
it, draw a frame around the area, and if the code fragment box is there, it
will show up with resizing points on all the corners. You can then either
delete it, or grab one or more of the resizing points and drag the frame to
a larger size so you can see it in the future, and double click it to open
and edit the code. If you added code to your page in some other way, then
post back with the details, and perhaps you will get a answer you like
better.

DavidF