Your question is not related to an issue with code used on your site, for which this Wix Corvid Forum is to be used for.
If you are looking for a simple turning circle say through html, then just search online and you will find many a page telling you how to do things.
Bit too technical but like this...
Either that or simply search for a simple turning circle gif that you can upload onto your site and use.
Somewhere like this - https://icons8.com/preloaders/