Sync with pavlovia when exp in builder is reopen

Hi!
I made an exp. in builder, uploaded it in pavlovia, it’s working fine, but each time I close the exp. in the builder and reopen again, I doesn’t find the project in pavlovia:
image
I didn’t put anything in this part of the settings:
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and I think I should probably have, but I’m afraid to put something in the wrong place…
I apreciate your help!
Gabriela

Nothing is needed in the online tab for a simple experiment.

What happens when you press the sync button?

Hi!
So: I built the experiment in Builder, uploaded it to pavlovia (in menu “Pavlovia.org”, “new”…).
With the experiment still open in the Builder, I make necessary changes (jpg to JPG for example) and each time I “sync with web project (at pavlovia.org)” it works, the changes are syncronised in the online version.
The problem is when I close the Builder, later open again the experiment in Builder and try to sync again, I get this message:
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Because my experiment is already running online, with participants doing it, I don’t want to creat a new project, I just want to make changes in the existing one.
Can you help me with this?
Thank you,
Gabriela