I didn't your query!
Is it something like your Muse gets stuck or items are immovable.
Make sure that you first check your Master Page.
Sorry, Musa work well, the items are immovable and not modificable in the master page
Strange! can you please share your .muse file?
You can delete all the other pages and save your file with a new name.
Share it with us via any sharing service you like Dropbox.
I really think, it would be a very good idea, to have a look at these tutorials here, before wildly clicking around in the application.
Even you are right
I was trying to modify the master elements on the wrong page,
However how do you create logos such as facebook's F and other?
You can't create logos in Muse – just as you can't create logos in InDesign or Word. You can place logos, which you have created in Illustrator or Photoshop or similar applications.