The old tutorial we had for posting pics was moved to the Back Fence and with time it has disappeared, it seems.
Most of us use imgbb.com to host our pictures, I think. Once you upload, you will be given a choice of imbed codes - "BBCode full" works with this forum. Copy and paste the code from ImgBB to your post here. If you click away from the imbed codes, pressing "C" will bring them up again.
Use the "preview" function here to make sure everything will work before posting.