How can i check if I correctly put the Google Analytics pixel on the remarketing section of Joturl?

You can check whether the Google Analytics remarketing pixel is triggered or not.
In order to do that, please follow these steps:

1. install the Tag Assistant extension within your Chrome browser
2. click on the Tag Assistant icon and enable it
3. open a new Tab
4. now paste your tracking link by adding ?dbgrmrktng at the end (e.g., http://example.com/alias → http://example.com/alias?dbgrmrktng)
5. "Tag Assistant" will check your pixels and will provide you with detailed information

Please note also that, in any case, as reported on the Google documentation, a new pixel may have a delay in showing stats up to 24/48 hours.