Add WLAN Interface (IP Adressen entsprechend anpassen) 
OpnSense Version
OPNsense 17.7.12-amd64
FreeBSD 11.0-RELEASE-p17
LibreSSL 2.6.4
| Interface - Wireless - Device | +add [Description]  | 
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| Interface - Assignments | select network Port and Press +  select the Interface Name crated  | 
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| General configuration Enable Interface Descritpion [WLAN] IPv4 Configuration Type [static IPv4]  | 
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| Static IPv4 configuration  IPv4 address [10.20.20.1]/24  | 
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 Common wireless configuration -   | 
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| Network-specific wireless configuration Mode [Access Point] SSID [name des Signal] WPA [x] Enable WPA WPA Pre-Shared Key [passowrt] WPA Mode [WPA2]  | 
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| save & Apply Changes | |||
| System - Gateways - All | +add gateway Interface [WLAN] Name [GW_WLAN]  | 
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| Services - DHCP - Server  (Select the WLAN Tab)!!!  | 
Enable [x] Range add from to DNS Server [add IP]  | 
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