Hi Gracie, I agree it's not obvious how to use parts of the site -I'm not a techie & have struggled to make it out myself in the past. I do all my forum stuff on a laptop so don't know whether it works differently on the phone app, but here's what works for me . . .
1 Click on My Messages tab in blue bar top L of screen. That should bring up the message/list of messages.
2 Click on the message you want to reply to.
3 Click on Reply top R of screen. In the pink bar at top of screen it should say New Message.
4 Enter the name of the member you want to send a message to in the "To" box just below the pink bar.
5 In the middle of the screen below the row of emojis you should see an empty box in which to type your reply.
6 Type in your message & when you've finished, click on the Send Message button bottom R of screen.
I'm assuming you were able to access the message, so if you want me to send these instructions as a PM, please let me know via this thread. I hope this works for you. If not please don't worry about replying.
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Wx