Open up your favorite web browser and browse to http://www.yourdomain.tld/forum/upgrade.php (where Forum is the location of your forum). Provided you set the permissions correctly on Settings.php and Setting_bak.php and uploaded all the files, you should see a form with the following tick boxes:
- Backup database with the prefix "backup_yourprefix_".
Ticking this box will cause the SMF upgrade utility to save a copy of your original Forum database tables prior to upgrading their structure (it is a good idea to make your own backup anyway.)
- Put the Forum into maintenance mode during upgrade.
Ticking this box will put your Board into maintenance mode during the upgrade process so your users will see a friendly note that the Board is being upgraded, rather than a page full of errors.
- Output extra debugging information.
Ticking this box will cause the upgrade utility to display extra debugging information during the conversion or upgrade process. This is useful if you experience problems and want to report them.
Once you have selected the desired options, click the continue link. Depending on the size of your board, the upgrade process may take a while - hold tight, while it may seem that nothing is happening something reallly is, so don't click continue again until the screen reloads - you will notice because it will say different things about what it's doing.
Next: Finishing up