The first page is a section unto itself. As your document flows to additional pages, they become member pages of the same section, unless you choose Insert menu : Section, or Section break. In a Page Layout style document, you can arrange pages by dragging thumbnails about. However, in a default word processing document, you cannot just rearrange individual pages in a section by dragging their thumbnails. Also, if you attempt to delete what you believe is one page, the whole section gets whacked, so beware of that.
Click on the current page 8 thumbnail, and at the end of that page, Insert : Page break. Click on your page 2 thumbnail, and copy/paste all content on that page into your temporary, new page 9. Back to the page 2 thumbnail, select all text on the page and backspace to remove, and your page 2 will disappear in the thumbnails. If it doesn't, select View menu : Show Invisibles, and see if there is a blue horizontal line across the top of that page, which you would then double-click to select, and then backspace to remove. No confusing this nonsense with simple.