Here is my table:
CREATE TABLE group_edits (
vfile_id bigint(20) unsigned NOT NULL,
editor_id int(10) unsigned NOT NULL,
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
Current selection does not contain a unique column. Grid edit, checkbox, Edit, Copy and Delete features are not available.
`ID` int(11) NOT NULL AUTO_INCREMENT,
If you are absolutely sure you can make a unique primary compound key of (editor_id, vfile_id), go ahead and do that.
ALTER TABLE group_edits ADD PRIMARY KEY (editor_id, vfile_id)
You'd be wise to use phpmyadmin to dump a copy of the table first, so you can restore it if you mess it up.
That should permit phpmyadmin to let you update rows in the table.