I've been trying to upload a picture into one of my posts and I simply cannot figure out why it's not working. Help?

you see all those buttons above the face icons when you're writing a response or w/e?  Click the one that is like a picture frame and you should get two img in brackets thingy's... basically you upload your pics onto something like photobucket and copy the picture (right click on picture once you uploaded it and select "copy image location"... that will give you a url) inbetween the img things.  If you need more help, I'm sure someone much more tech savy could give you more specific instructions... lol but hope that kinda helped. 

I dont think you can "upload" a photo into a post. If you have the photo hosted somewhere else on the internet then you can link to it.