While this could almost certainly use improvement and clarification, for people wanting to start using TOTP auto-entry, some basic instructions I wrote for a KeeTrayTOTP github issue (placeholder may vary for other plugins):
You’ll need to add the TOTP fields to Kee’s id/field listing in the browser plugin’s configuration. Different sites will likely use different field IDs, since TOTP doesn’t seem to have any standardized field name. (If you need that ID, right click the field itself and inspect element to see the code that defined it.) Once you’ve added it there, go to the specific entry you want to enable TOTP entry through in keepass. Kee tab > form fields subtab > Add. Name can be anything (I just name these all TOTP), Name is the field name. ID is the field ID, Value (assuming you haven’t changed KeeTrayTOTP’s default placeholder in settings) is {TOTP}. Make sure you click the Enabled radio for use of placeholders with this entry.