Hello,
Well there is default login and register links in wplms header top menu .
You do not need to put link for the login register .
If you want your own custom links and hide the wplms default login and register link then we need to hide it by the help of css .
Try adding the given css in your wp-admin -> appearance -> customize -> custom css to hide the login link :
a.smallimg.vbplogin {
display: none;
}
Try adding the given css in your wp-admin -> appearance -> customize -> custom css to hide the register link :
a.vbpregister {
display: none;
}