This page will tell you how to do this......good luck.
http://www.maintainyourcar.co.uk/1999_hyundai_accent_window_winde.htm
How do i check the transmission fluid in a manual 99 Hyundai Accent?
The 2005 Hyundai Accent has a 5-speed manual.
The 2006 Hyundai Accent has a 5-speed manual.
The 2011 Hyundai Accent has a 5-speed manual.
The 2002 Hyundai Accent has a 5-speed manual.
The 2009 Hyundai Accent has a 5-speed manual.
The 2007 Hyundai Accent has a 5-speed manual.
The 2012 Hyundai Accent has a 6-speed manual.
The 2001 Hyundai Accent has a 5-speed manual.
The 2013 Hyundai Accent has a 6-speed manual.
The 2014 Hyundai Accent has a 6-speed manual.
The 2010 Hyundai Accent has a 5-speed manual.