I'll let Jack write this one, I'm not pretending that I'm good at computers
I've always used imageshack.us for all of our images, you get 5GB of free space and it is simple to upload stuff onto it, yes the interface is a bit basic, but once you find your way round it, it isn't a problem. Generally it takes a bit of just hovering over the different buttons to find out what they do as it isn't obvious straight away.
Also, once you have the photos you want in an album, it gives you the BB codes for every single image in the album which can all be copied and pasted at once into the reply box. One word of warning though, this only pastes them as thumbnails, so for each image in the code you have pasted, you will have something like:
You just need to delete the .th to leave .jpg otherwise the images will only appear as thumbnails. It sounds like a lot of work but doesn't take long, even with a big album, as at least you aren't copying individual codes for each image.