How to re-generate thumbnails

[vdevang]

Site link: http://www.picsfantasy.com

Recently I moved above site from one hosting to another. Now the problem is that no thumbnails for any photo shows up. I don't know why.

Is there any way to re-generate thumbnails for the existing photos in the gallery?

If yes, how exactly?

This is little urgent, please help

[Nibbler]

Use the admin tools page.