I have done so, actually added my daughter to four 25 pt AKV contracts. Contact Member admin or email MS and ask the forward the info. They send you the instructions and forms you need. The process is that you need to submit a request to change the owners to
DVC who will then give you a ROFR automatically as long as at least one of the previous owners will still be on the deed. Once you have the ROFR, you then need a deed. A quit claim deed will work but some say it may interrupt the chain for a title insurance if you later sell. One can get a FL quit claim deed template fairly easily, I found a word file online when I did it. You then submit the deed with all signatures notarized and TWO witnesses. The notary can be one witness but they have to sign separately as a witness in addition to notarizing the document. You then send the ROFR, deed and payment to Orange County (assuming WDW). We were able to get the 4 deeds down to one page and all ROFR for the 4 on one document of 2 pages so right around $50 for the change. Once recorded, you complete another form and send a copy of the recorded deed to DVC to change the ownership. In the past they've had fees for this but I don't think they are charging anything right now.