ImgBB — Upload Image — Free Image Hosting
This is a good working picture upload and sharing website.
Start by registering. You can use google accounts to log in if you want to save the trouble.
After registering, u can start to upload images. You can create new albums for each upload.
To put in pictures in forums, select Get Embedded Code, then choose BBcode Medium Link. Copy the link(s), and simply paste them onto your forum.
Any questions do feel free to ask me. Have fun!