Hello Jannika and welcome to the Lyx-world!
1.) i'd like to import a graphic (eps) into my lyx file. even though i
do not get an error message, neither in lyx nor in the pdf file does
the graphic show.
Maybe you don't have the converter program (imagemagick) installed?
2.) when i try to export my lyx file into postscript or rtf format i
get an error message.
What message?
i use lyx 1.4.4. on a macbook (os x).
any help is appreciated, but please write instructions so that i (not
even remotely a computer expert!!!) can follow them.
I use Ubuntu so maybe Lyx on OS X is different. But the more verbose you
are on your problems the easier it will be to help you.
Good luck.
