Fix Autoresponder

I installed an autoresponder in my server, but the script is not sending any message, I think is a problem with the cron because the admin panel show this message... "Your cron job has not been triggered for its last 3 expected runs. You should contact your host to make sure that it is still functional" *I need somebody to fix this problem *My maximum bid is $30 usd por the proyect *If you need any aditional information about the server you must contact with my hosting provider. Thanks