How can I mark a private Facebook message as unread on my android phone?

[btterfly1234]

I like to read my messages, and if I don't have time to respond to them right then, I mark them as unread and that way I remember to reply later. On my laptop, I can click on the message, click on the actions button, and mark the message as unread. However, on my smartphone, there is no actions button. And I cannot find anyway to mark the message unread. Is there a way to do this?? Thank you!