Hello. I have 2 non profit organization and have received 1099-k from Stripe.need guidance on filing tax

Hello. I have 2 non profit organization and have received 1099-k from Stripe. We collect payments through stripe. 
 It is my first time filling tax but I am unable to understand the system on your portal. Can you pls give me step by step guide on how to file separately for both business and declare 1099-k income. My both organizations have tax exempted status too.