Do you guys know how to use root cert

I am using wss, but the cert I am using with the site, it can not validate the root cert.
I have the root cert, I probably need to import that into the security context of httpOK.

Do you guys how to do it?
The root cert is authentic and displayed as valid on android, it just that maybe CA is kind of new, the root cert is not included in the trust store or something.