Image Button plugin DOESN'T WORK

Hello,

I cannot set up the image for the image button plugin on https://route-66.xyz/ After I select the image type (by clicking the related radio buttons “link template” and “details page”) I click “save setting”. The gear on the “save setting” button start to turn…and never stop!

If I come back in the same page nothing is saved…

How can I solve it?

Thank you!