If you selected to restore a Personal folder, the next page shown lets you select which user the personal folder belongs to.

Select the appropriate user and press Next.

The following page lets you select the personal folder to restore. If the folder still exists in the database and you are simply trying to refresh its contents, then select the folder from the drop down list. If the folder no longer exists in the database because it has been deleted, but you suspect it does exist in a backup then select the Folder is in backup radio button and press Next.
In the case where the folder no longer exists in the database, the next page shown will allow you to find the folder from previous backups.

The following page lets you choose whether or not to restore any sub folders that exist under the folder you want to restore.

To restore sub folders, ensure that the Include sub-folders radio button is selected. To complete the restore of the folder data, see Finishing the Restore Wizard.