hey i installed the witcher 3 goty edition and right after this gog.com sh*t now it says not connected to the internet so i click on start connectioon and it lends me to a site where i can enter a gift code and i have not such thing so i cant do anything so i cant start any connection help pls

1) You do not need Galaxy to run the game. Navigate to the folder you installed it and the executable should be located in the bin folder.
2) If you are talking about a retail version, there should be a GOG code, either in the inside of the disc case or on the manual that you can use to register your copy on GOG.