Then click again "File" and "Open" and select the photos that you want to put in your GIF.
After opening those pictures, go back to the original window then click "Windows" and choose "Animation". And then a window will appear.
Then, drag all the photos that you have chosen to the GIF window.
Then on the animation window, duplicate it 4 times ( We will duplicate it 4x because we have 4 sample photos. You can duplicate it as many as you like depending on the number of photos)
Then click on the first frame on the Animation Window and click on Layer 1 on the layers window. Hide the remaining 3 layers by clicking on the "eye-like" icon on the side.
The do the same on the second frame and layer 2. Hide the remaining layers.
And when you are done, click the play button. You can also adjust the fastness of the GIF.