Www.lacrossetechnology.com/8248 need to reset time!

I'm not totally sure what you mean by "reset the time" because the unit normally sets the time automatically from the WWVB radio time signal. If you want to do it manually, this is what the Instruction Manual (PDF format) says:

MANUAL TIME SETTING

In case the atomic clock is not able to detect the WWVB-signal (disturbances, transmitting distance, etc.), the time can be manually set. The clock will then work as a normal Quartz clock.

1. The hour digits will start flashing in the upper LCD.
   
2. Select the desired hours by pressing and releasing the + key.
3. Press and release the SET key to advance to the minutes setting.
4. Now the minute digits will start flashing.
5. Select the desired minutes by pressing and releasing the + key. If the + key is held, the units
   will increase by 5.
6. Press and release the SET key to confirm the Time setting and continue to the Year setting.