formulas and Kword

I'm writing a technical paper by "kword" The problem rises when I have to insert any graphic. I was used to Staroffice and to Latex. Basically I have to just write 10^-21 . I selsect Insert-> formula. From the bottom meny bar I select "x" with a small square ot the right left corner but what appears on my work sheet is a big square ... Basically it does not include the spece-hlder for the exponent. Later on I'll have to insert some pictures .. I expect a lot of headache ... hoping it works .. Is there anyone who has experienced with kword and can give mne some hints ? Thanks a lot. Maura