Well first you go to infopop.com (where you hopefully purchased the UBB), you go to the Members Area, and you download the latest version, you unzip it, you go into the help folder, and read the instructions. Easy as pie.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.