Hello and welcome here.
To play a game first of all you have to download the right version of the game :
Sudden Strike : Hidden Stroke 2 (Édition Fusion 4.1b) Link One
or
Sudden Strike : Hidden Stroke 2 (Édition Fusion 4.1b) Link Two
... by the way sorry for you but the game is in french ...
Then you need to have a look on this part of the forum :
http://forum.sudden-strike-alliance.fr/sudden-s ... on-f4.html
Where there are topics for games in the week (Semaine in french) or the weekend, you can register for one or more game in each topic (just by saying : i'm here every day or i'm here only monday and tuesday).
Usually there is at least a game every day around 9.30 pm (UTC +1 : Paris time).
In your case the best thing is to come early, around 30 mins before the game and ask someone to start a "test" game with you.
This in order to check that your configuration is ok for playing.
Hope that you got all you need to play.
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Pas encore Don Love mais bientôt digne de l'être