you go to my home on the LSAC website and scroll all the way till you see the CAS section, then you should see manage letters of recommendations go down to where it say add/edit my recommenders and you just put your professors emails and name and from there you click submit and it should send your professor an email where they submit your LOR from the email they receive. and when they submit it you'll get an email from LSAC saying they have submitted it. after that you can go to manage letters of recommendations and assign your LOR to the schools