Mapshare as iframe in web page - password issue

So I've managed to add mapshare in an iframe to my wordpress site but have come up against a small issue.

I really want to have the mapshare password protected as it's only for family and friends, however when I add a password to Mapshare then try to access it via the iframe on my website the firewall will not accept the password and reloads the firewall page.

Has anyone had experience with this and found a way around it?

I have already used a password on the particular webpage on my website but hoped to have one on Mapshare itself.

Any help would be greatly appreciated