Some things you have to check:
- Check if
wp_footer
function is called in your footer.php file. - Check if the toolbar isn’t disabled in your user settings.
- Check if toolbar is showing after disabling all plugins you are using. If yes, then turn plugins on one by one to find out, which one of them is hiding the toolbar.
- If disabling plugins didn’t help, switch to some standard WP theme (Twenty…). If it helped, then it is some problem with your theme.