I am a freelance writer and I get payments from clients. 

In Zoho books I added a payment I received from Banking > My Bank Account > Add Transaction > Money In > Payment from Customer.

After that, when I checked the income report no income was still showing up. 

Please tell why isn't it showing up and how to fix it

It is showing in unearned revenue. How do I convert it to real income. 

I did not make any invoice for it. Is that the reason?