How can I change 'Pay with PayPal' to 'Buy Now' on my payment button?

[Fynorix]

I want to change 'Pay with PayPal' to 'Buy Now' on my payment button

my site is fynorix.com

Thanks in advance for any help

[Samsund]

You can did that with just a simple touch and some expertise 

Let me know if you have some things to ask me