New contacts under leads

I´m confused. in LEADS the company field is not active. Therefor I cannot assign new contacts to this lead. Why is that. It is not handy because a lead focusses on a company and not on a person and sometimes its a quest to find the person responsible. But you still want to see the history of calling to this company and all the relevant information of how you got there and to see additional notes you made at other contacts. Is this because we use the free version>