Purchasing the NFT does not give you voting rights in the DAO. Voting requires holding the CODE token. You can acquire that by buying the token on the open market following the guide below or earning CODE by participating in the DAO.
Purchasing CODE tokens
When trading tokens, please confirm you're interactive with the official contract. You can verify the CODE tokens contract address by checking token.developerdao.eth.
We use a service called Guild to manage the access to our community.
If you hold the D4R NFT or at least 400 CODE tokens, or any other tokens that give access (i.e. Hackathon participant NFTs), joining the server is a heading to the DAO's guild profile and connecting your wallet.