Back on topic, everyone.

As Blue above said, if you cannot change, or do not have the access to DNS, then you are not the primary owner of the domain. I would ask the company to transfer the name to a registrar of your choice, even if there is a fee involved. Keeping control of your own domains, and not relying on third parties for managing it, is a necessity in web-based ventures.

I registered it at strato, one of the biggest internet company in Germany and Europe. I talked to them, basically they say they dont offer dns changing service but if we want we can transfer it to somewhere else. They say we can only change ipv4 or ipv6.
So as i understand from your posts, i have to transfer all my domains. thanks

Quite honestly I do not have experience with Strato, but I am aware that European ways of handling domain names is tougher on consumers. Having said that, I don't know why they do not give you access to DNS management, so yes, I would pick another registrar that you like and transfer domains where you have full access.

Most easy picks would be: NameCheap.com, GoDaddy.com, Moniker.com, eNom.com, Name.com, etc.