The CDN provider Sirv offers lots of features and has a free plan that will work for most cases (learn more about Sirv here). To be able to use this service you should first create an account.
Go to https://my.sirv.com/#/signup and provide the requested information. You’ll then have access to the Sirv dashboard where you can manage all your pictures and folders.
In the Sirv_IS module, there are 3 site properties that should be configured, via Service Center: ClientId, ClientSecret and SirvDomain.
To get the proper values for ClientId and ClientSecret go to https://my.sirv.com/#/account/settings/api.
To get the value for the SirvDomain site property go to https://my.sirv.com/#/account/settings/content-delivery and copy the Sirv Domain value.
If you don’t want to create a Sirv account, you can use a Local fallback by changing the CDNServiceToUse Site Property under the ImageCDN_DRV module to Local.
After doing this, you are all set! To use ImageCDN just download the ImageCDNReact for Reactive Applications or ImageCDNMobile for Mobile Applications!