Here is the simple steps to add your company logo into your salesforce account
Before get into the steps we need to upload the image/logo into your salesforce account, you can able to upload the image under documents tab

Just login into your salesforce account,

  • Go to yourname --> setup -->appsetup -->Customize-->homepage component 
  • Under the custom component click New and then click next 
  • Give the Name as Logo and select the type as image, click next
  • Click the insert image button and select the image/logo file
  • Then click save
Now we are successfully uploaded logo into salesforce, next step is we need to enable the custom component in the home page layout
  • Go to yourname --> setup -->appsetup -->Customize-->homepage layout
  • Click edit the layout
  • Then select our component after that click next
  • Move our custom component in the top of the left side column
  • Then click the save button  
That's it, We are done! Company logo is added into your salesforce account click the Home button.

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