Using the smartphone app for the site (available for both Apple and Android) you can select the photo you want from the phone to attach to a post.
If you have the photos on your computer, like the ones sent to your email there, you can attach them here using this
button. It opens a box that lets you know what type of files are allowed, and their maximum size.
This does not pertain to you, but if you are posting a photo from a website, you can copy the image URL and paste in the pop-up box that this
button produces. If you host your photos online somewhere, this is a great way to post them, as you do not have to reduce their size, as they are primarily just a link to here, taking up no space on the FGRV server.