Add NBT tags to items

huh?

I want add NBT tags for player. 

@#2 Hi my propably czech friend. I recommend you use class tht extends IExtendedEntityProperties

@#2.1 how to do this in mccreator?

yea how?!?

i need a nbt tag to store data for a new mod

Until the NBT is added (or coded, more logical to say) on Mcreator, you can use the category "Code" and add the NBT you want in the class generated by Mcreator of your block or object or something else or the added custom things that are not in Mcreator without code!