2
1. FTP the entire local XOOPS directory to the webhost
2. Import the entire MySQL database into the database on the host
3. Modify mainfile.php from your local installation to fit the new URL, path and database details
4. Upload mainfile.php and write-protect it
5. Write-enable the cache, templates_c and uploads folders
All the installation does is fill the correct details into the mainfile.php and create the tables, but since you already have that more or less, you should not do it that way.