Anyone uses Jex?

I'm trying to modify some equations in OpenOffice and I had to download Jex, a MathType clone for OpenOffice. The problem is - it's java driven and I don't know how to install it. I installed java but I don't know how to run the program as an 'ordinary user'. Any kind of help would be appreciated.

Jex Installation for Openoffice 2.0
You must have permitted macros to run in order to use this installation procedure. If you accidentally click on the boxes more than once or as the wrong user, no harm will result.
If you have upgraded Openoffice, you should repeat the steps in red.





Close all running instances of Openoffice [under Windows you must also close the Quickstarter located on the taskbar status area] . Open this document again as an ordinary user.




While Openoffice continues to run

1.run Jex as root or administrator by double-clicking on the jex.jar file, or from the command line by running java -jar jex.jar
2.select “Install Office Fonts” from the “Install” submenu of the “Tools” menu in Jex; select “Install Java Fonts” from the “Install” submenu of the “Tools” menu in Jex
3.close Jex and run it again as an ordinary user
4.select “Install for Office” from the “Install” submenu of the “Tools” menu in Jex
5.[if you are using Linux open a console as root. Type locale charmap<enter>. If the result is ISO-8859-1 stop. If it is not, for example it is UTF-8, type which openoffice.org-2.0<enter>. Then cd directory-in-which-openoffice.org-2.0-is-located<enter>. Then gedit openoffice.org-2.0<enter>. Before the line exec /etc/openoffice.org-2.0/program/soffice "$@" insert the line LANG=en_US. Save the file. Note – this is not about the language but about the encoding of strings. If the language is en_US.UTF-8, for example, some symbols will not display correctly. You should be able to use other languages than en_US as long as the encoding is 8-bit and not UTF-8.]
6.close Jex and all running instance of Openoffice


You will now be able to insert and edit equations by typing ctrl-m in Openoffice