Animation of background rotation

Hello everyone, I’m working on a small video where I have an object with glass material. The world HDRI is black with colourful lights that get reflected in the object.

I would like to animate the rotation of the HDRI, but I cannot find the way to do it. Can someone help me with this? I normally move the HDRI from here (see picture below), but there’s nothing to activate the frames.

Thanks in advance

right click insert key frame should work

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Thanks a lot!