You seriously need a “How-to” for uploading wallpapers. (and probably a lot of other stuff). It is nearly impossible to find anything on this site.
I have no clue where to start. It took me over 2 hours to find out how to add my Paypal account - partly because my paypal account uses a different email address, and fore security reasons, I wanted to login to that email account from a different machine. Now you have added that email account to Pling as a “second email address” - carefully destroying my security barrier, and probably in contravention of the GDPR.