How to record my voice using MP3?Urgently need help!!

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Hi ,everyone..TO be honest I am internet user but my limited knowledge bout computer is so limited. I got an email from translation job provider offering job as voice over and he asked me to send my voice sample ( he sent me the script i should read) and save the file as MP3 or Wav file. I am not that familiar with those things, and there is another provide requiring me to send my voice sample. Could you please help how to do it in my laptop/PC?Please help ASAP..thank u