i have created a network on my mac but forgot to add a password so either want to delete it and make another or just add a password but cannot figure out how to do it.
If you mean you selected internet Sharing in the Sharing tab of System Preferences, open the Sharing Tab again and uncheck internet sharing. Then select Internet Sharing and click on WiFi Options. Click on the Security button and select WAP2 Personal. Now you can enter a password. Now click on the checkmark to start Internet Sharing again.