Hi Wendy,
Thanks so much for reaching out, I'm sorry for the delay in our response. I appreciate your patience immensely.
You can purchase more numbers by going to the Numbers tab in your top menu, and selecting "Numbers." There you should find a button that says "buy a phone number" (on the left side of the top panel).
Here is more information on puraching numbers (and toll-free numbers):
https://www.ringroost.com/how-to-buy-phone-numbers.php
You might also find this video helpful (the section about buying phone numbers is about 5 minutes in):
https://www.youtube.com/watch?v=Qts8jcK60l0
I hope you find this helpful. Let me know if you have any lingering questions.
Warmly,
RingRoost Support Team