To close your store for public:
- In the administration panel, go to Settings > General.
- Choose the Close storeftont checkbox.
- Enter some value in the Access key to temporarily closed store field.
- Click the Save button.
For example: if your store is here: http://www.your_site.com and you enter secret in the field, you will need to use this URL to access your store: http://www.your_site.com/index.php?store_access_key=secret.