(Based on GIMP tutorial: Simple Animations)
Import JPEG images by dragging files
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To specify different delay for some frames, Edit Frame Attributes by right-clicking on the frame name:
Append a space and the delay in milliseconds between parenthesis. This is for 2 seconds: framename (2000ms)
Click on Export button
Export As a GIF image:
Select GIF option As animation and Loop forever
Define Delay between frames, around 1000 ms will do it, but change as wanted
Define Frame disposal to replace
Select Use delay entered above for all frames if you do not want to specify different delay for some frames.
Select Use disposal entered above for all frames
Click on Export button