Modifying A Table From A View

I have two tables, a data table (MainTable) that contains a user initials and other empty rows and then i have a user table.

I also have an inner join view with the initials from both tables as the joining field.

I want the users to be able to modify the data table (MainTable) but also display the users name field.

here is the sql of the view:

SELECT dbo.MainTable.DateCreated, dbo.InitialsListing.Initials, dbo.MainTable.CustomerNumber, dbo.InitialsListing.AdvocateName,
dbo.MainTable.Supervisor, dbo.MainTable.Complete, dbo.MainTable.FirstNotify, dbo.MainTable.SecondNotify, dbo.MainTable.ThirdNotify,
dbo.MainTable.AdvocateInitials
FROM dbo.InitialsListing INNER JOIN
dbo.MainTable ON dbo.InitialsListing.Initials = dbo.MainTable.AdvocateInitials