An interactive on-line Access database

I have created a data-base and published the forms and tables on the share-point site : [login to view URL] I need someone to be able to modify my Microsoft access forms. the data base is about 10 similar organizations, I want each company to be able to access their own data on-line and modify it, but not be able to access others. This requires a username and password function for each company. also i need that as soon as one inputs the data, confirms it, the color of the box in form must change to show that it has been updated.