Everyone wants money now
I remember 5 1/2 years ago when I first came to Delphi. You could link an image from just about anywhere. Now, the sites where you store images won't let you link from there, and Delphi won't let you link images from another site.
The only thing you can do is pay Delphi for webspace, or find someone with Delphi Plus who has a lot of space and will let you store your image on their webspace. Then you can type in the address from where they have it stored