Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
First of all, for full access to all your Yahoo! email account, you should (if you aren't already) use the official Yahoo! Mail app:
which will allow access to Drafts and other folders, when configured for IMAP access.
As for other features, and how to use them, this YouTube video is a rundown on such matters, which should be helpful if your tablet does not have Android version 5 on it...: