At the moment, there is just one set of credentials you can use to access SearchAdsHQ. Adding more users to your account is currently not available.
Please note, that reports you download and auto rules email notifications go to your login email address. If you would like to add more users to receive reports and auto rules email notifications - contact SearchAdsHQ, we will gladly help you!
We have team access feature in our roadmap. In the meantime, you can share your account among other people by simply sharing your login details with them.