few questions about router settings.

1. should I change the admin username even though the password is unlikely to be guessed? 
2. login configuration> Maximum Unsuccessful Login Attempts  is set to 5. can I make this higher or lower? it locked me out once already which is a pain to reset.
3. should I disable SSID broadcast?

do I need to change anything since the tech installed or is everything already secure as it should be?

thanks.