The initial setup of the slingbox itself must be done from within your own network; which is sounds like your husband has done.
Confirm that he has set it up and it has passed the "remote internet viewing" screen during the setup.
At that point you should be able to go to http://watch.slingbox.com/watch/sling_player and log into your account with the email address and password your husband setup for the account. this will then allow you to watch the slingbox.
If your using the old stand alaone version of the slingplayer desktop software; then you need to input the slingbox id of your unit in order for it to be able to connect. you will then be prompted for a user and password which again---your husband setup during the initial slingbox installation.