Hi Christine,

If you go to settings inside your project. Then you can choose the Publishing Template.
 

Here on the right side, there is a dropdown named Identity. If you click on this, a field named Logo will appear and this is where you upload your company logo. Remember to save changes
 

Now it will be your logo appearing where ever you used to see ClickLearn in your project. 

Here is also where you can change the color of your portal and font styles, and overall customize the entire look of your project to have your corporate look and feel.