@Streti:
I'm showing you as registered and active as of today, so the issue is most likely one of two things.
First, try logging out of the archive and logging in using the upper right fields. The center login fields have a known issue and only work once during activation. Thereafter, they give you the blank page result.
If that doesn't work, I recommend logging out, clearing your cache and cookies, and then logging in again using the upper right login fields. Sometimes a corrupted cookie in the string can have this effect.
Once you've logged in successfully, you should see a "Welcome Back, Streti" message in the upper right corner. You should also see an option below that for "Control Panel" which is how you now access the old author's panel functions. On the left are the subdomain listings, and below those are clickable links to add, edit, delete and remove reviews. You can also manage your profile and other functions there.
If you still can't get to that page, let us know what operating system and browser you're using, and we'll see if we can't come up with a solution.