Hi,
Yes, the whole operation can be made with the phpMyAdmin.
In mine looks like in the screen - sorry for the polish, but in english it should look quite similar.
Just open your PS DB, and find ps_access table. In column 'actions' (polish 'działanie') there shoud be icon 'delete' (polish 'usuń')
Then click 'Import' on the top menu, then 'choose file' ('wybierz plik'), and then click 'preform' ('wykonaj')