Follow these steps to upload your theme in Blogger:
STEP 1: While exporting the theme in TemplateToaster You have to add google account. If you do not have any google account then add new account and click ok.
STEP 2: Log in to your administrator dashboard.
STEP 3: Navigate to Template –> Backup/Restore from the left sidebar menu, to add the theme. After clicking Backup/Restore you will get a dialog box as shown below.
STEP 4: Browse and add the .xml file of your template.
STEP 5: Your theme is uploaded now. You can view blog to see your uploaded template.