You can either add a datagrid of accounts on the company form and use the association or create a dropdown/search form with companies on the account edit screen.
'I have that but when I try to create an account I can`t edit the Company fields. As Administrator I want to create accounts with Company's. – Gabriel Kidane (2015-05-29)'
I thought your question was just how to display data from the Company on the Account record.
In order to create the two together, I would create a new non-persistable entity in your domain model that contains the information about the account and company in the same object, and use a microflow button to process the data entered :