Hello,
By far the best place to do that is to edit the Login page template file. You will find it in
data\Base_Theme\templates\default\Base\User\Login\default.tpl
The edit itself should be pretty straight-forward. It's a checkbox field, so you don't need to hide it, you can simply remove it (checkboxes do not return value in REQUEST variable if they are unchecked during the submit of the form, so the code is prepared to handle missing key).
Please note that after you apply your modifications, you should backup that file as updating EPESI will overwrite it.
Kind regards,
Arek
