Search bar, booking form & Check out page

Hi,

This is really a nice theme.
I have 3 questions:
(1) In the main page, how can I center the search bar within the column since I only set 3 attributes, so that the search bar is shorter than the original long one.
(2) When I do the translation with Loco translate, I can’t find the string “Booing Form” & “Enquiry Form” in both travelWP and travel booking. Where should I find?
(3) For the Checkout Page, How can I edit the default form, which is not suitable for tour booking.

Thank you for your help.

Best Regards
Eric