This guide will show you have to set a theme for your pop-ups on screen like this:
What are Themes?
With Themes, you can personalize how to showcase your achievements. Themes allows you to personalize the screen background that pop-ups when a task has been done, meeting booked, offer sent, or product sold. Some of the themes are immediately available, while others you’ll have to unlock.
Navigate first to your profile page by clicking on Profile in the top right corner.
Click the Edit profile button in the top right corner.
Click on the Appearance tab.
Click on the theme that you would like to have.
Notice that some of the themes are locked. The criteria for unlocking the theme is described below.
You will unlock this theme when you win a competition.
You have unlocked this theme and can now use it.