Installation of SMS Gateway
PHP 5.6 or above
PHP cURL extension
PHP GD extension
PHP Multibyte String extension
PHP Zip extension
PHP XML extension
Add a cron job by executing below command in linux shell. If you are using the Cpanel or Vesta Panel then follow a guide from here to setup a cron job.
crontab -e * * * * * php -q "/home/blunap/public_html/cron.php" >/dev/null 2>&1
You can find frequently asked questions from here.
If FAQs doesn't resolve the issue you are experiencing then you can open a support ticket from here.