Hello Karola.
I'm no computer gene, but I've successfully posted a few images. If you get a prompt that the file you are trying to up load is too large you can take the original photo, and rescan at a lower resolution [If your equipment gives you that option.] You can come down from 300 dpi or higher, to say 100 dpi; or you can use a re size function in most photo editing programmes. Also just save as a simple jpg file and not a full data file like a tif etc. Not a good resolution for photo quality print outs, but quite OK for the limitations of a computer screen.
There are also more technical ways of doing it that you will find on the photo restore / advice forum, like emailing to yourself in a programme that automatically downsizes the image. A saved jpg file in the range of say 150 to, I think, the limit might be 500 Kb, should come up quite OK, and not be too small to view on screen.
- Alan.