[Cant type on one of two linked text frames, only in one of them.]

Hello everyone. I'm trying to set up a book for formatting. I linked the text boxes on my Master Pages so all of my pages would be linked. Now I'm trying to label some pages that I have to type out and aren't on the manuscript, copyright page on the left and author note on the right. It won't let me type on the right text frame, no matter how or how many times I click it, when I type the text shows up on the left text frame.

I tried typing with the text frames unlinked, and it works, but then I link them and the text on the right gets moved to the left. Do I really need to press enter a million times to type on the right text frame?

Thanks in advance, its my first time using Affinity Publisher, I am more used to InDesign.

[Is facing pages the same as mirrored pages?]

Hi! Quick question.

I'm unable to find the mirrored pages or mirrored margins option on Affinity Publisher. Is facing pages the same thing?