Your own ID is to find in the web interface. Go to
System -> System information.
You will see a page like this:
Right here, you can decide if you want to send the information or if you don't want to. We strongly recommend to agree because it will improve the quality of IPFire and there is no harm because no private information is included.
The data a profile is only accessible if you have got the ID that can either be inserted into the box on https://fireinfo.ipfire.org or you can click on the ID link on the web user interface.