On Mod i cant add new things

(soory for my bad english)

I i creadet a new mod but since 3 day the test dev is not working

and if i add some new things and then download the mod to try it out on my normal Minecraft the New things are nod included

so every thing i add i can see in MCreator but not in the game?

pls help me

for more question im reddy to answer you