I want to open 80 firewall port please help us

KM Sugar

For Out of office, you can use WAF or DNAT rule or Remote Access VPN to connect application on HTTP Port 80.

For other network if it's connected with firewall directly, Firewall rule can be helpful. 

WAF and Remote Access VPN (SSL VPN or Sophos Connect client) is more secure as compared to DNAT Rule.

Its ok can you please send me snap shots or process

Its ok can you please send me snap shots or process

KM Sugar ; Which firmware version do you have in the firewall?

https://techvids.sophos.com/ will help you for the configuration of above suggested.