Greetings, Wendy!
You need to find your school's installation of Moodle. This moodle site is for developers and users of Moodle as a software product. There aren't any courses here for schools.
I would suggest that you look over the materials your teacher gave you and see if they provided a link. Another possibility is to go to your school's homepage and search for "moodle" in the search box (only some schools don't call it Moodle, but maybe yours will!). A third option is to use a search engine and put your school's name and Moodle into the query and see what turns up.
Good luck finding it!
atw
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How do you find your teachers page on moodle?
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