The graphene install docs is in your language and will walk you through the install process. Their support page points you to discord, telegram, matrix support channels as well.
https://grapheneos.org/install/
https://grapheneos.org/contact#community
As a general rule anyone that asks for a non-proprietary thing that will do everything their proprietary thing does without alternative solutions allowed is so far from the reality of non-proprietary software in a proprietary world that they can not be made happy so I’ll leave the support of that to others.
or… is it?