You have the ability to create your Welcome Guide at any time, even if you don't have a sitter confirmed just yet. When using the website, there is the option to create/update your Welcome Guide in the 'Edit Listing' section, which can be found by going to the 'My Home Listing' part of your dashboard.
If you're using the Mobile App, you can create and update your Welcome Guide by going to the 'Me' section of the App and then clicking the 'View & edit listing'. Once there, you go to the 'Edit my Listing' section and will see the option to update your Welcome Guide.
To share you're Welcome Guide, your sitter will need to be officially confirmed via the platform. Once your sitter is confirmed, you will be presented with the option to share your Welcome Guide via your dashboard under the 'My Upcoming Sitter' section. Before you share the Welcome Guide, you will always have the option to update it first and create a welcome message for your sitter.