Mark you cannot upload and tag a 'landscape' photo in the forums
these things live in different places on the website--after you go to the landscape photos page as Bev has outlined, and after you put in a photo and tag it, then you can click on the image and copy the location of the image and paste that address into a thread to post the image into a thread, in the forums
here is what the address of this one looks like in brackets
{https://garden.org/plants/multi/view/3001/}
and with the brackets removed, the image appears instead