Specify image size - The following image(s) are missing width and/or height attributes

Hello at StackIdeas,

We are fine tuning our new web site and have several images which not show size, some of them are in EasyBlog.

I have tired to figure out how to set the image size in the cover of a blog but so far not found.
Please let me know where I can set th cover image size.

Thank you...

...Finn