ok heres some steps

1. put a small amount of solder on your hot iron
2. hold the soldering iron on the motor tab until you can melt solder onto the tab (there should be a nice little blob
3. now hold the soldering iron on the wire until you can melt solder onto the wire (there should be a nice little blob)
4. now set the wire onto the motor tab and hold the iron on top until the solder from the wire melts to the solder on the tab

note: make sure there is always a small amount of solder on your iron when you do each step

heres a link to a short movie of how to solder dean plugs (its basically the same concept)
be paitent the video make take a minute or 2 to load [link]http://www.ezonemag.com/~awilletts/deansultra.mpg[/link]