How to make a double sided copy on HP C7820? -

Hello. I have just printed a brochere that needs to copied so that the page is double sided. So the merge these two pages into one double sided page, what do I do on my HP C7820 scanner/copier? Please help! Thank you!

HP don t list a C7820 printer/scanner. Are you sure of the model number ?

i usually just print one page and flip the page around (with the words facing you-not upside down) and print the other side