Please do the following steps and see if it helps.
- Create a text box.
- Expand the text box to be 100% width.
- place the text box at the top of the page.
- Select the Copy (Cmd+C) your logo in Muse.
- Double Click on the text box and instead of typing (where you can type in the box) Paste (Cmd+V) the logo (that is copied to your clipboard).
- Now the logo acts like a character and can be left aligned, by using the Text-Aligning tool in the Text panel in Muse.