An EasyChair account is needed to submit to ITC2021.
If you do not have one, please register here.
After login, from the EASYCHAIR option on the menu, choose Smart CFP.
Then in the search box, write ITC2021 and press Enter. Click on ITC2021, after on Submission link and then on Make a new submission.
The submission link is the same for any type of work (extended abstract or final work).