You can always find any Welcome Guide that has been share with you in your dashboard. On your dashboard under the "My Current and/or My Upcoming Sits" you will see the option to view the shared Welcome Guide there.
You will need to have your sit confirmed via the platform before an owner can share their Welcome Guide with you. If you can't see the option to view the owner's Welcome Guide under the "My Current and/or My Upcoming Sits" then there will be an option to request for the owner to share it with you. This will send the owner a message to let them know that you have requested for their Welcome Guide, and will prompt them to get it shared soon.