i can not post bmp’s why ?

Is there a reason why you want to use BMP instead of a more web-friendly format such as PNG or JPEG?

The short version is because bitmaps are typically large and not all web browsers support displaying them (though the latter reason isn’t as true as it was years ago). Quite frankly, when it comes to sharing images, there are much better formats to choose from.

png is lossless and better for web.

i can olny create bmp whit pov ray
and i want to show what i can do whit it

Then I would suggest resaving that output in another format. There are a variety of programs that you can use this, from command line tools like ImageMagick all the up to full graphics suites like GIMP and Photoshop.