We will be adding Schwab once they get their API to us, which should be before May. There is a detailed thread about that at
https://forums.medvedtrader.com/topic/5296-update-td-ameritrade-schwab-account-migration/
If your accounts are all there, BY FAR the easiest and best result option is to just open a new TD Ameritrade account. It will not be moved to Schwab until May 2024, and by that time Medved Trader will have Schwab integration.
Specifically using this link: (otherwise the links on the site point to opening a Schwab account and make it difficult to find the link for TD Ameritrade)
https://start.tdameritrade.com/select?entity=103
If you need it for just data, just opening one and funding minimal amount to keep it open would suffice. If you want to trade, I would open one that is the same type as your primary trading account and then just transfer the assets from the Schwab account to the new TD Ameritrade one. Would tie things up for a few days but then would be able to trade.