Friar_Tuk says:
I can't find any way to use a pre-gen character. I won't have time to do data entry until later on this weekend.
It seems you need to create your own, most of this is for people new to the site so a few extra steps if you've created characters before. Go to the first page and right click on an image to save for the character (Assuming desktop not mobile), left click on the portrait to see stat blocks, etc. in the top right there's a small flag logo you can click to save to your library for use later. Go to characters tab on the site, scroll to bottom of the page under new character and enter the name tag you want to remember the character by (I used SN - Name so I know they're PCs for the Summer Night One Shot), select system (Savage World) from the list alphabetically and it's defaulted to PC. Enter in the information from the original sheet. Where it says Change Avatar in red click that and upload the picture.
Shortversion: Create a character with the same name and picture and submit, use the flagged version for the data and your empty character to post (If you're doing this through mobile only it might work). Also feel free to ask questions.