Welcome to BobRTC! Here's a few tips to get you started.
Log in to BobRTC with your Discord account.
When logged in, click on your user name in the upper right hand corner. In the pulldown menu, click on Preferences and set your audio options (make sure to give permission to use microphone when asked)
Click on the Phonebook link next. There are two types of numbers to call. Toll Free and Non Toll Free. In order to call Non Toll Free, you must earn tokens by calling Toll Free numbers.
If you don't get any audio at all while trying to make a call, check that you've given permission to use your microphone by clicking the icon to the left of the BobRTC URL. This usually looks like a lock. You can give permission to use the microphone there.
If you have any problems, create a thread in the forums. I hope this helps. We'll have a video out soon to go over all of BobRTC's features.