As the title says, how do I let you know if I have a problem?
The best place to raise issues with the software is here in the forum. Ideally, raise a new post per question. The cadasio team monitor the forums regularly and will respond as soon as possible.
If you are experiencing an issue with your account such as payment or password issues then I would recommend using the contact us page on our website.
Is there anything in particular I can assist with now?