figured it out all by myself.
PHP Code:
INSERT INTO phrase VALUES('', '0', 'setting_sigmaximages_title', 'Total Number of Images In Signature', '5000');
INSERT INTO phrase VALUES('', '0', 'setting_sigmaximagest_desc', 'The total number of images in signatures.', '5000');
INSERT INTO phrase VALUES('', '0', 'sig_image_too_many', 'The total number of images in signatures is limited to $vboptions[sigmaximages].', '1000');
INSERT INTO `setting` (varname, value, optioncode, displayorder, grouptitle, defaultvalue, advanced, volatile) VALUES ('sigmaximages', '3', '', 143, 'user', '3', 0, 0);