Hi.,
Thank you for contacting us.
1) You can edit the login link in the header from the files in this folder wp-content/themes/lms/framework/headers/. You need to edit the corresponding header file which you have selected in dashboard > appearance > header. For example if you have chosen header1 in buddha panel, then you need to edit header1.php line no: 48 – 55 approx.
2) Sorry we do not have that feature in our theme.
3) We will consider adding captcha option in our future updates. Thanks.
4) Just add this css code in Dashboard > LMS > Integration > Custom Css to remove the active menu border.
#main-menu > ul > li.current_page_item > a { border: medium none; }