Recover password set complexity

When a user forgots his password he gots a new autogenerated one.
Where can I change the complexity of the autogenerated password?

Many thanks.
The minimum complexity for passwords is set in your membership provider configuration in your .config file. Unfortunately the MS password generator that the FBA Pack uses has it's own minimum complexity - so even if you turn down the required complexity, it won't likely affect the complexity of the generated password.