Hello Naima,
Not sure what help you're requesting. Do you have the Administrator password for login into the Admin portal of the ASA5505? Or, is it you're not sure what to do once you're there? Or, you're not sure how to configure the ASA for Port Forwarding?
Take a look at this document:
http://www.cisco.com/c/en/us/support/docs/security/asa-5500-x-series-next-generation-firewalls/113024-asa-82-port-forward-00.html
Thanks
Glenn