To save passwords, you need to enable a system-wide Password Manager service, such as AutoFill by Google. Saving passwords via AutoFill is fully supported by Hermit on recent versions of Android (O, P, & Q).
That’s it, you’re done.
Now go back to Hermit, and when you browse, you will be asked to save passwords when you login for the first time. Enabling AutoFill by Google will also enable saving passwords in many other apps and browsers besides Hermit.
If you do not want to use AutoFill by Google, you can use any other password manager as well, and it will be fully supported in Hermit.
The AutoFill feature was introduced in Android Oreo, so Android versions below Oreo (such as Nougat, Marshmallow or Lollipop, on which Hermit still runs) cannot support saving passwords. See Google’s blog post here.
Note that this limitation is caused by Android and your phone manufacturer, and we cannot do anything about it. Please contact your phone manufacturer for a System Update for your phone, or try with a newer phone.