if you are not tracking labor through the DC modules you could use WO-F to enter the labor for that WO in question then use WO-N to post it. Once that is done you then close the WO off. If you are tracking labor through the DC module then depending on your settings you may have to post the labor through DC-H.
An another note there is some WEB training available on the ISTECH website, for a price of coarse but it maybe to your advantage to check it out.
http://www.istechsupport.com/traininglibrary.php well worth it if you are not that familiar with EVO.