The help centre
Short answers to one question at a time, searchable, and the same words inside all three apps as on the site: the help centre. This documentation is the spine; the help centre is where you go when one specific thing is confusing.
Rating an answer
The thumbs under an answer. Choosing one opens a short sheet: pick what went well or badly and add a line if you want. It reaches us with the discussion attached, so support sees what you saw.
A rating names the seat and the model that wrote the answer, which is what makes it worth giving: over a few weeks it says which model actually leads well on your kind of work.
Reporting a bug
Send feedback in the account menu, on every app. Attach the discussion you were looking at and we see the transcript. A report is stored before it is mailed, so a misconfigured mailbox on our side loses nothing.
Reaching a person
The the support page says how, and what to include so the first reply is useful.