Option 2.
The second option is for you to head over to rither bioRxiv or medRxiv and upload all your necessary files in order to have your preprint posted. You can do this by clicking the relevant visual below. From both bioRxiv and medRxiv, you still have the option to choose to submit your manuscript for consideration to StemJournal via "direct transfer" – simply pick StemJournal from the title list when you are ready to move your paper from preprint into the journal the submission process.