Before you can generate an ad tag and place it on your website, you have to submit and wait for your website to be reviewed. Your website has to be approved during the review process before you can proceed. You will be notified by email about the outcome from the review process.
If the website you submitted is not listed in the Adverti Dashboard, it was most likely not approved during the review process, and you will not be able to generate ad tags for this domain.
To get started, simply copy the ad tag from the Adverti Dashboard and place it in the code for your website where you want it to appear.