You can change the name of your site by clicking on the main settings cog on the bottom left of the screen and then click
Settings:
From there you can select the website tab at the top of the screen:
From that tab you will be able to update the website name:
Once you have updated the name of the website you can then add a logo to the site by clicking on the picture icon next to the settings cog on the website logo section:
Once you have selected a new name for your site and added a logo the page will update to show the new changes:
Once you have selected the logo you can then hover over this to change this a little quicker if you want to update this in the future:
You can also choose to just keep the website logo in the top left-hand corner: