Modify size
Image → image size (scaling) or image → canvas size (cropping scaling), which is set to 500px*500px here. It is important to select all the layers, edit them → freely transform them and adjust them to the appropriate size.
3. Add a word to the picture.
Select the top layer, add a layer, be careful not to change the state of the small eyes in front of the picture (don't change whether to display the layer), write the required text, and then you can save it.
4. File → Save as web format parameters are shown in the figure below.
Pay attention to two points. Choose gif in the upper right corner and forever in the lower right corner, so that GIF can be modified simply. You can simply control the picture size (occupy space) in the upper right corner and choose to optimize the file size.