I have this warning

Warning – The default user group for guests is undefined! Please visit the SP usergroups admin page, map users to usergroups tab and set the default user group

I deleted the original “guest” user group but now I have added it back but I cannot find anywhere to set this as default.

In manage user groups there is a list of the groups but there doesn’t seem to be anywhere to set any group as a default group.

So basically how do we set a group as a default user group?

Thanks