Click on the open menu for creating a new project and enter the huge world of photoshop. The world of image manipulation is now controlled by your fingers.
The File explorer will open, now you have to find the picture which you want to edit or manipulate (In positive manner).
You can see there are many tools in left side of the application, you can use these tools to edit picture
Choose the type of image you want to save, If you are using it for social media, You should go with JPEG or PNG