You can't. Not on your own.

But if you are making a Team entry this year, make sure to message @cinossu on Discord, and he'll work his magic to make your entry into a team entry! Make sure to tell him your team name, and who else is in your team. Your teammates' SHC user names would be appreciated!

Cinossu Edit: Of note, all of your team members will have access to any team entry. That includes updating it as well, in any way. This means that, should you be unable to get the entry completed in time, someone else from your team can instead. This includes updating the descriptions, uploading images, even the main entry upload itself. It's a pretty useful thing to have set up if you're working on a team.