From late March, 2018, Twitter changed their terms of service such that scheduling the same Tweet to multiple Twitter accounts would constitute a violation of their terms of service. RiteForge uses Twitter's API for scheduling to Twitter and to avoid facilitating a violation of their terms of service, you will find that you now can schedule to just one Twitter account in the RiteForge Composer's social media profile picker, at the top. If you attempt to add an additional Twitter account, it will not be added:
Note that you can add other social profiles, Pinterest Boards, etc., just not more than one Twitter account.
You can also use the Leave open after sending option at the bottom of your Composer so that once you've sent or scheduled your post, you can change to another Twitter account, modify your post a little, so as to placate Twitter, and send/schedule to another Twitter account.