Okay, to make things easier and because I have nothing better to do. Here is how to post images you have on your computer to bomberblitz.
First you need your image, a site to host (I use imgur because its easy).
Second click new post (upload), then you can drag your image into the area that shows up or browse to the images location via browse. i'm lazy so you only get drag.
now that you've dragged it in you can add more images and do the same again or just drag multiple at once and it will work.
next you want to right click (secondary click for mac users, or touch and hold for mobile). and click copy image address (chrome), url (firefox/safari)
then paste it in a post and add whatever you want to say as regular text as you would any other post.
then hit post