Please use the explorer mode to upload multiple files.
The steps are as follows:
1) Get to the destination (where you want the files to be)
2) Click on “Actions” and on the drop down click “Open with Windows Explorer”
3) You simply have to copy the files from the source and paste them here.
Pointing your SharePoint site after signup
Adding a new SharePoint site with new domain
How many SharePoint sites can I add?
Adding/Modifying themes in SharePoint
Backup and restoring SharePoint sites using SharePoint Designer