Shopify Inbox App Message using phone number not showing up

[jake_lue]

Hi, I tried to use this app cause seems pretty interesting. The problem is that I can't find the option to use phone number instead of email when sending sms. I tried checking the app at admin dashboard, but got no luck. If anyone can help me bout this, I'd appreciate it alot. Thanks!🙌🏼 

Current chat where I can't use a phone number to send text