If you are desperate, you could use Photobucket's editing option.
If you just need to do simple things, like cropping, enlarging, color corrections, typical of email use or net posting, there is a really good and stable Freeware application called
IrfanView, which does all that, quite nicely.
I can recommend this one with enthusiasm, for the simplest tasks. You can't patch or alter photos, though, like in Photoshop or GIMP.