Or if you don’t want to bother with a hosting site like imgur, you can attach photos directly.
On a smartphone from the mobile version of the forum, click on the paperclip icon in the top right corner and follow the prompts to your device’s photo library to attach pictures.
In the full web version of the forum, “Go Advanced” below the quick reply window, scroll down to “Manage attachments”, and proceed the same way to your pictures.