I am having trouble setting my skyscan atomic clock i took the battiers out and need to reset the whole clock.The modle number is 88900-8901

Taking the batterys out and leaving them out for 60 seconds or more will in effect reset the clock. Put the new batteries in and wait for the skyscan to detect the outside temperature (if this unit has a outside sender). after this show on the screen push the button that corresponds to your time zone. You can now set the clock with the push buttons or take the clock to a wall that faceing? ( you don't say where you are located), the WMV signalyou need to set the clockto is coming from Colorado USA ( if your in the us) so make sure the back of the clock is facing toward colorado. let the clock sit overnight as the best signal will be recieved when its dark and especially in the very early morning, just before sunrise. this should automatically set the clock for you. good luck