This is essential step for most flows for which you need tekos app.
Download the json file and import it to your tekos flow

In the credential node (red one to the right) you have a set of input fields.

user_access_token - It's your personal security token. You can find it under profile Settings -> Help & About -> Advanced and here you have it, also you will find here the home_server

user_id - You can find it under the setting tabs or in every room members tab. (e.g.

tekos_server_instance - This is the prefix before in your flow instance (e.g. You can easily find it in the URL of your flow.