Factura Cliente

Hello, install the system and run very well. I have already tested their behavior and I have no complaints about it, it is very useful and with many functions. I go to the forum since I have several clients created but I can not generate an invoice for the client, I saw in some videos as in the client tab the option that says invoice, but in my case it does not go out, I attach the image.
I hope you can help me.
Thx in advance

In your case you have set your customer as prepaid. Change type to recurring payments, and then under biilling change billing period to prepaid 1 month.

Thx for the support is all good now.