Thanks for reaching out to us in the land of the forums. You can change the guest password at any time, as long as you are doing it on the home network...just like you did when you set the device up originally. We have included a link that will show you how to do this.
How to create a Sling Account and Slingbox password for guests
Hope this helps,
The Slingbox Moderation Team
Thank you for your help - but - it seems to me that the procedure you pointed me to on that page, will add a password for another (a 2nd) guest. Is that correct, or does entering a new Guest PW erase, and over write, the previous guest password. Perhaps there a limit of one guest passwords at a time being set up. I sort of got the impression that the SlingBox reset button would have to be pressed in order to get rid of the first Guest Password. Is this true? Again - thanks for your reply!