changing my password under cygwin

I've got postgresql installed with cygwin under xp.  I need to alter my password but I can't find anything that works.  Everything I've tried so far hasn't made the change and gives no feedback as to what might be wrong.  Here is the command I use to run the psql tool:

psql -U username -d template1

Here are some things I've tried that didn't work:

alter user username with password 'userpass'

net user username userpass

This is the command I ran before I created my username, but now when I run it, it asks for a password which I either never knew or forgot:

psql -d template1

I could even delete the user and re-create it as long as I wouldn't lose access to the system.  Thanks.

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