You can always do it later. No need to answer this message. Better use it for reading and figuring out how it all works here.
Try to join a contest with everything you post. There are contests for posting photos and if you add a certain text to it you might join a different contest with it (2 contests with one post).
I wish you luck on Steem and above all fun.

@team-ccc/@hive-166850 have a post "contests running", if you have a look at my other profile @wakeupkitty.pal you find tips for new Steemians.