What rights do renters have when living under an HOA?

We signed a 2 year lease in June. When we signed, we were very upfront that we have 5 vehicles (we are living with adult brothers and sisters to combine living expenses), and we were told nothing about an HOA of any guidelines they have. Since then, we have been harassed nonstop and now are bing fined for some of our vehicles being parked on the street. It's not anywhere in our lease about parking regulations, or about an HOA or guidelines. We really have no other options as our garage is being used for storage. We have nowhere else to park. We would not have moved in here had we been informed and are being harassed by both the HOA and the management company. What are our rights and do you have any suggestions. We've contacted the HOA repeatedly and they won't call or email us back. The one time they did, they aside e have no rights because we're renters.