you don't import it, but upgrade right over it (backing up of course) the installer imports all the data from your current install.
this post describes upgrading from 8.2 but the steps are mostly the same.... www.dragonflycms.org/W...id=91.html
In the download please refer to UPGRADE.txt found in the documentation folder
Sorry, I updated from Nuke 7.8. All I did was make a copy of my database, create a new database upload the copy to the new database, then used the install.php. Worked like a Charm. I didnt realize it was that easy at first . Everything seems to be running ok, but like it says diable the blocks and modules before you install. The nuke themes even work great!
Server specs (Server OS / Apache / MySQL / PHP / DragonflyCMS):