To find the round of e-counselling for a candidate using the application number, you need to visit the official counselling website of the authority conducting the admission process. After logging in with your application number and other required credentials, you can check the candidate dashboard. This section will show your allotment status, including which round you've been allotted a seat in. If allotment lists are published in PDF form, you can search your application number within the list to see your round and seat details.