Now apps can be uploaded to the apptimemachine site but after that I can't see the apps which I uploaded on timemachine, why is that?
Well uploaded apps to App Time Machine are not immediately shared with Whited00r users. They must be first checked for virus or malware and then manually test on iPhone and iPod Touch running Whited00r to make sure they work then they go to the list of stuff to be uploaded to their server.
Since the App Time Machine Team is small, it takes time as they are also working on the server & website as it is a new project in development and besides, they have a life outside of App Time Machine.

...Btw, when I try to upload a IPA to ATM I put the GERMAN Store URL into the text field, but nothin happened. So only US links are working?
App Time Machine (ATM) is requesting that iTunes app's link because:
1- They want to make sure that the app's old version is not a paid app still offered in iTunes.
2- It makes it easier for them to get the app's icon & correct name & description.
3- I guess they don't speak all languages so
linking to the iTunes US store app's page makes life easier for them.

If you have a link for an other country store, it is easy to change it to the US one.
For example a Google search with
Facebook + itunes depending on your browser settings & if you enable Location or Personalizing Results may return the German iTunes link for that app. In the URL example below the ...com/
de/ is the German store identifier. It's easy to change it to /
en/
https://itunes.apple.com/de/app/facebook/id284882215?mt=8https://itunes.apple.com/en/app/facebook/id284882215?mt=8Or you could change your Google preferences to search in google.com or use Advanced Search and select show results in English only.
More tips about searching iTunes stores by specific country in the
Searching Non USA iTunes Stores paragraph of The solution is in the Apps Forum sticky
(it means an important thread pinned at the top of the forum list) [Tutorial] Whited00r 6 How-To Find iOS 3.1.3 iOS 4.1 & 4.2.1 Compatible Apps - iTunes Filter 3.x