If you already have signed up for combined login of WPT and TB, there should be a button going from TB to WPT if you first sign into TB. There is one going in the other direction
Single Sign-On (SSO) relies on a user's EMR ID and so it is not possible to navigate to the WebPT EMR when directly logging into Therabill. If Therabill is the main application you use, you can set your default application to Therabill to be redirected there after logging in through the WebPT EMR.
https://therabill.zendesk.com/hc/en-us/articles/360013425691-Single-Sign-On-SSO-with-WebPT
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