[ubuntu] How to make a file executable

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http://ubuntuforums.org – I have downloaded OpenJDK Java 6 Runtime because I need it to enable my Internet Scrabble Club game. I did it using the Terminal. But when I try to use it I got the following message: "The file '/home/sandra/Desktop/wordbiz.jar' is not marked as executable. If this was downloaded or copied from an untrusted source, it may be dangerous to run. For more details, read about the executable bit." I did download it from a trusted source, and I do want to make it executable, and I don't understand the complicated instructions on https://help.ubuntu.com/community/FilePermissions P (Hardware)