If you have forgotten your Admin password this can be reset using the following steps (v5+ only): 

1. Edit the Pulse.cfg file in the conf directory where Pulse is installed.

   Default: C:Program FilesPulse for TM1confPulse.cfg 

2. Change the following setting Reset to true:

   [Password]
   Reset = false 

3. Save the file.
4. Restart the Pulse for TM1 Application Server Windows service