Moving and copying pages are performed in an almost identical way. It's simply the difference between which option you choose.
Open Umbraco and navigate to the Content tab.
Navigate to the page you want to move or copy.
Hover your cursor over the title of the page, move it over to the 3 black dots that appear to the right and right click.
This will open up a panel expanding to the right. From here you have the multiple options including "Move" and "Copy".
Select the option you want (the following steps are identical regardless of the option you choose here).
The panel should refresh and you should now see the root of the directory.
Navigate through this directory to the node you want to Move/Copy your page to and click on its title.
The left of the node you selected should now show a blue check mark. Click the green button located at the bottom right of that panel (it will be labeled "Move" or "Copy" respectively).
If you wish to change the title, replace the text in the text box at the top of the page (right above the "content" tab and "Optional page title") with what you want to change it to. Afterwards click the "Save and publish" button at the bottom right (or change it to the "Save" option) to save your changes.
The page wont automatically publish, if you wish to do so hit the green "Save and Publish" button at the bottom right of the screen.