FOR UPDATE clause allowed only for DECLARE CURSOR

Can anyone please advice what is wrong with this part of my cursor statement:

declare @ColumnName nvarchar(30)
declare @IsUpdated tinyint
declare @UpdateCursor cursor
select @ColumnName = ColumnName , @IsUpdated = IsUpdated from MyTable for update of IsUpdated

I am receiving error:

FOR UPDATE clause allowed only for DECLARE CURSOR

This is the first time I am creating cursor, but as far as I know the statement for update looks correct