Welcome, @Royalmidwife/Martine!
As @Karen_E noted, if you have any questions about how/why/what for joining TH, just ask. Either here or in an appropriate topic.
@NickyLambden may not have noticed your post. It helps to tag the user with “@” as I just did, so they’ll get a notification.
You can also search the forums for related info. I found this topic:
On a Boston-ish note, was just discussing a “last-minute” sit in Cape Cod. Just see the listing of the first post: Cancellation by sitters
–Geoff