If you are continuously seeing errors trying to manage your homepage or you simply cannot make any changes at all, it might just be that you are still accessing your site through the placeholder domain that is provided to you when you first get your site.
Here is an example.
When your site was first delivered to you, it would have been on something like example.us.engagementh.com or somedomain.engagementhq.com.
These are only placeholders that are in place until you have set up your primary domain, that means the actual URL that you want people to find your site under. Once that has happened, make sure to access the site through that new domain and no longer through your placeholder engagemenhq domain.