morning @gorgeous-cpu-18947, I haven’t visited the onboarding wizard in a while but I’m surprised it’s not something we don’t allow you to do from there. cc @white-airport-8778 for feedback.
In order to add an SSH key to your existing integration
1. head to Org Settings > Integrations > Installed Integrations (GitHub).
2. Then click Next after selecting the repos you want to connect.
3. Click YES on “Do you use private git modules?” and enter your key
4. Click “Complete setup”
Any time you want to change any settings for your integration you can head back to this page