TL;DR: Everyday you can enter 2 contests for the following day. You submit your photo and use the tag for the contest you want to enter it in. So say you wanted to enter in to #goldenhourphotography today you would just put that as your first tag. A bot will swing buy and upvote you. :)
Read this: https://steemit.com/introduceyourself/@photocontests/readme
TL;DR: Everyday you can enter 2 contests for the following day. You submit your photo and use the tag for the contest you want to enter it in. So say you wanted to enter in to #goldenhourphotography today you would just put that as your first tag. A bot will swing buy and upvote you. :)