Configuration on NAS Asustor

Hi I was able to install Gitea on my NAS and I have access to the main page. I keep all the default values. I created a new user and I was able to create a new repository. With Visual Studio 2019 I created a simple WPF application and when I try to push the code to my repository I have this error message:
schannel: SEC_E_UNTRUSTED_ROOT (0x80090325) - The certificate chain was issued by an authority that is not trusted.

I use Bitbucket and I do the same think without problem.

Also I wasn’t able to find a step by step documentation on how to configure Gitea. It would be a must. The only think I saw is I can use the certificate by default on my NAS but I don’t know how to do that.

Thanks,
André