In your chatbot library, click into the chatbot you want to change.
Then at the top left, click "Manage Chatbot". From there, you can change select different GPT models to power your Dropchat bot with.
You can also adjust your Temperature and Top P parameters, which can also alter the quality of responses you receive from your chatbot.
Hover over the question mark symbol to get an in-depth explanation of the effect of changes these parameters.