Chatbox has a web version and installers for Windows / macOS / Linux; the setup is the same.
Open Settings
Click Settings in the bottom-left corner.
Choose the provider and fill in
Save and chat
Click Save, open a new conversation and send a message.
API Host must include /v1. Some Chatbox versions append /v1 themselves: if chat returns 404, enter just https://gpt.teamsoclo.site to avoid /v1/v1.
Choose OpenAI API Compatible, not OpenAI or ChatGPT. Those two do not let you edit the API Host.
The Model field may be a dropdown with an Add custom model button. If your model is not listed, use that button and type the exact name.
Saving tokens in Chatbox
Chatbox resends the whole conversation every turn. Click New Chat when you change topic instead of continuing a long thread. Settings also has Max Message Count in Context; around 10 is enough for most use. 