You shoud do that if you can’t see the Mass update/actions all buttons:
Please mark the layout editor checkbox and unmark the view editor checkbox for your user, add the fields to the layout if you can’t find them under your user, after doing that you will be able to create a merge job.
https://sc2.zaapit.com/pdf/ZaapitTools__User_Guide.pdf
Mark only 1 checkbox (the enable zaapit layout editor checkbox), add the fields to the layout if you can’t see them: