studio

hi,
i m new to joomla and smartresizer was first plug in i wanted to check out and install. so i installed it and enabled it, since it was disabled when i went to plugin screen. then i set some values for it, at first i put only thumbnail width for blogs as 200 (do i enter 200 or 200px ) then i went to article manager, selected one of my articles and opened html source, there i found

and edited style in this way

clicked update and saved article... went to preview but there was no change. i tried different settings for plug in, i had my images in original size, and i had images with defined size it was all same. one thing i should mention when i update code and save article, and return to it again there are no changes in code, like it wasnt saved.
thank you for reading i hope theres cure for my noobness

this is wrong:
this is right:

and this path is wrong:

this is the right path:

Make sure that your changes are saved in article (open article in editor again and check your code exists)