Your average earnings greatly depends on a number of factors such as your Country, Device you are using and how long you have been using the site for. For example, for first time use for someone from United States using a combination of Desktop and Mobile devices, on their first day they could earn up to $50. Everyday after that they can earn $10-20 depending on how much time they spend on the site. The first time is always the highest because most of the high paying offers are available. Some offers only allow you to complete them once so then they do not become available anymore.
If you are already logged in, go to Settings > Password, and click the reset link at the top.
If you are not logged in, on the homepage click the Forgot Password link.