uPdating shared excel file on a network

I have a file that is used by multiple users and viewed on multiple computers through out the day and information is being changed peridocally, but only the first person who opens the file is allowed to make the changes beacuse all other open files are read only, also data does not updated on the read only files unless you close and reopen the file, is there any way I can set the file up to update in real time and have everybody have access to be able to make changes to the file. I have attached the file so you canbetter understanding of what the file looks like.