Custom Pricing Unit and Add To Cart/ Buy Button Functionality

[Jesiler411]

I need help with two items:

1. I would like to change the functionality of the add-to-cart and buy buttons. I would like to be able to input my own link here as needed. 

2. I would like the pricing unit to either say "per month" or "/Month" after the price is listed.

Can you help me with this?

[Shayanshan]

can you shere your store link so ill be beter understand

thank you