Would like to insert a <script> code inside all the pages of my website, and it has to be placed before the </head> code.
Can I manage this with muse? Else, each time when I export the site as HTML, I need to open the updated file(s) and copy and paste again the SCRIPT code in the HEAD.
Adding scripts to the head section of your documents is not currently supported in Muse, however it is planned for future versions of Muse.
You can add links for scripts using Object -> Insert HTML, but they will be inserted roughly at the position of the HTML page item.