From what you've posted.. are you actually including a valid signature? If you just have 'postingkey' in that place it won't be a valid transaction.
Most people use a library to do the ECDSA. I suggest dSteem. Or soon to be dHive? :)
If you need more help, I suggest joining one of the many community discords and jumping in a dev channel. I'm sure it will be easier to get live support there.
thank you! ye i tried the dev community but i was just put into the python section and thats it...
it sucks that for dhive i get this
https://www.dynamichive.com/#top
it has similar colors to the hive colors therealwolfposted XD
imma follo a bit this post to try n understand all this
im glad to know the problem lies with the signature, now just need to figure out how to get the right signature XD