Hi Maxflyer,
This has been an ongoing situation for a while now, the AIS AES tool is not very intuitive when you first start to use it. The easiest way to try to help is if you post the details of the flight you are trying to make and I will put the information in the tool make sure it works and take a screen capture (picture) with all the boxes completed, which I can then post on here for you or send by e-mail.
Let me know the details of the date, time, route or area etc you are planning to fly and I will do the rest. Also I'll post an explanation of the boxes and their contents in relation to your flight to give some background
I have been working on a document of explanation of this tool for a while, which I can send you and also there is a help document
here and an FAQ document
here. You will need to enter your password first after clicking the link and the documents are quite big so may take a while to display if you are using a 44kbps internet connection.
These are worth a read in the long term but I can get you going in the short term for the flight you are planning.
It has taken me a few months of investigation into this tool to find out all the ins and outs and at the moment there are ongoing discussions to make the whole NOTAM (or more correctly PIB) issue easier for GA pilots.
Mike Cross is the AOPA (and PPRuNe) expert on this issue. I just gave him a ring and he may have a moment to post some more supporting advice for you.
Hope this helps!
Andy
P.S. Once you get used to using the tool it becomes easier!!