Make a team owner of a project

I want to develop a project with someone, so I created the team. The person joined the team and he can change the branding of the project for example. The team is the maintainer, but we have problems contributing code. I am registered as the owner, but I want the other person to be able to commit without making branches. What should I do? If you can change the ownership of timey to TImey App Team, I'd be very grateful, but please tell me how to avoid this in the future and make the team the owner. Thanks in advance.