Make them PNG files (best compression vs picture quality) with 256 colors max. Then you can attach them to your post (as long as they are 34KB or less). Maybe combine several of the pics together if there are only a few colors (say 8).
The reason the pics can't be seen is because to see them the person looking has to log in to that server
Someone (I think it was yahoo) let's you post pics in a portfolio and anyone can see them without requiring a log in.
Side note: when you took the scope pics, did you a) take them in real-time mode not that useless "equivalent" mode and b) did you use a good high frequency probe with a very short ground tip on it at the nose of the tip?