How do I start loading information in the spread sheet?

I just signed up and I noticed a list I can start, do I do it from the website or enter each coin on the spreadsheet, after I sign in it gives me a chance to export all my coins, When I opened it its bland except for the top line. Now do I enter the coins on that sheet or do it from your website? I am a bit confused!

Hello,
Welcome in Numista.
But ...
you are on the french speaking part of the forum. Better chose the other one is you want an answer
you are on the swap forum, dedicated to people who want to offer or ask for coins for swap. Chose better which part of the forum you post in for more accurate and fast answers,
and for what yu ask, you have to enter you collection first. See there for info on how to ... https://en.numista.com/numisdoc/index.php

Regards, and have fun !