Step 1 - ensure your Nightscout profile is up to date [why?]
Step 2 - enter your Nightscout site URL to get started
Autotune is a system that recommends changes to your basal rate, insulin:carb ratio and insulin sensitivity factor based on the data recorded in Nightscout.
AutotuneWeb makes running Autotune easier by automatically generating an Autotune-compatible profile from your Nightscout profile, and running Autotune for you with real-time progress tracking.
For help with Autotune generally or AutotuneWeb in particular, first read the AutotuneWeb FAQs. If your question is not answered there, reach out in the regular Facebook groups or Gitter channel. Make sure you note that you are using AutotuneWeb, and include screenshots of your logs.