That having being said: when using a project (eg. an Arduino sketch), there's always an option that lets you configure the required settings, like SSID, channel-number, etc.
When using AT commands, you'll have to use the AT+CWSAP-command
For instance:
AT+CWSAP="QuickFix","",1,0
Which will set the access point with settings:
- SSID: QuickFix
- Password: <empty> (no password required, resulting in an open AP)
- Channel: 1
- Encryption: <none> (no encryption used)
AT+CWSAP?