i try to spawn my custom tree

hi guy i try make custom tree to spawn that is made on structure however i try it but won't work want it go to default tree as in the vanilla minecraft stay there and not as custom tree stay even i try with procedures that made from people because i have no good understanding about then only understand about ore and tools and armors even if give me video of tutorials that small tips in it not show more information about the topics and more demonstration and talk about not same thing i can only be help what i mean about.

if you don't understand then add me here on discord blazetoxic#1913 and pls call me i am bad in understanding if you use short words i even talk to me my psychological and he say just try listening for one's the just then you can think and you doing action