In order to stop receiving spam via the contact form, you will need to configure the ReCaptcha and enter your keys into the form configuration window.Read more
Adding a favicon to your website is easy, first make sure the file is called favicon.ico and then go to Files -> upload a new file. Your favicon should now display on your site.
To add your analytics code, add a new element - either in the header or the footer is good because then it's automatically on each page. Select 'advanced editing' and add a
element. Then go the element options via the cog wheel and paste in your analytics code.